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#include <algorithm>
#include <cstdio>
#include <set>
#include <utility>
#include <vector>

struct Range {
  int a, b;
  int i;
};

struct RangeP : Range {
  int p;
};

int n, k, m;

struct Points {
  int n2;
  int n_;
  int min_pointer;
  std::vector<int> count;
  std::vector<int> can_move;
  std::vector<int> add;
  std::vector<int> right;

  void Drop(int w) {
    can_move[w] += add[w];
    if (w < n2) {
      add[w * 2] += add[w];
      add[w * 2 + 1] += add[w];
    }
    add[w] = 0;
  }

  void DropOnPath(int w) {
    if (w) {
      DropOnPath(w / 2);
      Drop(w);
    }
  }

  void Subtract(int w, int p, int k, int a, int b) {
    Drop(w);
    if (k < a or b < p) {
      return;
    }
    if (a <= p and k <= b) {
      add[w]--;
    } else {
      Subtract(w * 2, p, (p + k) / 2, a, b);
      Subtract(w * 2 + 1, (p + k + 1) / 2, k, a, b);
    }
  }

  void Erase(int x) {
    const int pos
        = std::upper_bound(right.begin(), right.end(), x) - right.begin() - 1;
    int poc = pos;
    int w = n2 + pos;
    DropOnPath(w);
    if (can_move[w] != 0) {
      poc = -1;
      while (w) {
        if (w % 2 == 1) {
          Drop(w);
          Drop(w - 1);
          if (can_move[w - 1] == 0) {
            w--;
            while (w < n2) {
              w *= 2;
              Drop(w);
              Drop(w + 1);
              if (can_move[w + 1] == 0) {
                w++;
              }
            }
            poc = w - n2;
            break;
          }
        }
        w /= 2;
      }
    }
    poc = std::max(poc, min_pointer);
    count[poc]--;
    Subtract(1, 0, n2 - 1, poc + 1, pos);
  }

  int Min() {
    while (count[min_pointer] == 0) {
      min_pointer++;
    }
    return right[min_pointer] - count[min_pointer] + 1;
  }

  void SetN(int n) {
    n_ = n;
    n2 = 1;
    while (n2 < n) {
      n2 *= 2;
    }
    count.resize(n);
    right.resize(n);
    can_move.resize(2 * n2, 0);
    add.resize(2 * n2, 0);
  }

  void SetCount(int pos, int cnt) {
    count[pos] = cnt;
  }

  void SetRight(int pos, int r) {
    right[pos] = r;
  }

  void SetMove(int pos, int cnt_move) {
    can_move[pos + n2] = cnt_move;
  }

  void Init() {
    min_pointer = 0;
    for (int i = 1; i < n_; i++) {
      if (right[i] == right[i - 1]) {
        can_move[i + n2] = can_move[i - 1 + n2] + count[i - 1];
      }
    }
    for (int i = n2 - 1; i >= 1; i--) {
      can_move[i] = std::min(can_move[2 * i], can_move[2 * i + 1]);
    }
  }
};

std::vector<RangeP> ranges;
std::vector<Range> group[1000005];
Points points[1000005];

// Deletes the biggest point <= x.
void ErasePoint(int g, int x) {
  points[g].Erase(x);
}

int MinPoint(int g) {
  return points[g].Min();
}

bool ComputeGroup(int g) {
  std::sort(group[g].begin(), group[g].end(),
      [](const Range& a, const Range& b) {
        return a.b > b.b;
      });
  struct compare_by_a {
    bool operator()(const Range& a, const Range& b) {
      if (a.a == b.a) {
        return a.i < b.i;
      }
      return a.a > b.a;
    }
  };
  std::set<Range, compare_by_a> active_ranges;
  int im_at = 1e9 + 1;
  auto collect = [&active_ranges, &im_at]() -> bool {
    const Range first = *active_ranges.begin();
    active_ranges.erase(active_ranges.begin());
    if (first.a > im_at) {
      return false;
    }
    im_at--;
    return true;
  };
  int n = (int) group[g].size();
  points[g].SetN(n);
  int cnt = 0;
  for (int i = 0; i < n; i++) {
    const Range& range = group[g][i];
    points[g].SetRight(n - 1 - i, range.b);
    while (!active_ranges.empty() and im_at > range.b) {
      if (!collect()) {
        return false;
      }
      cnt++;
    }
    if (i) {
      points[g].SetCount(n - 1 - (i - 1), cnt);
      points[g].SetMove(n - 1 - (i - 1), (int) active_ranges.size());
      cnt = 0;
    }
    active_ranges.insert(range);
    im_at = range.b;
  }
  while (!active_ranges.empty()) {
    if (!collect()) {
      return false;
    }
    cnt++;
  }
  points[g].SetCount(0, cnt);
  points[g].SetMove(0, 0);
  points[g].Init();
  return true;
}

int position[1000005];

struct compare_by_b {
  bool operator()(const Range& a, const Range& b) {
    if (a.b == b.b) {
      return a.i < b.i;
    }
    return a.b < b.b;
  }
};
std::set<Range, compare_by_b> active_in_groups[1000005];

void ComputeEverything() {
  std::sort(ranges.begin(), ranges.end(),
      [](const RangeP& a, const RangeP& b) {
        return a.a < b.a;
      });
  std::set<std::pair<int, int>> last_moments;
  int im_at = 0;
  auto collect = [&last_moments, &im_at]() -> void {
    std::vector<int> which_groups;
    for (const auto& moment : last_moments) {
      which_groups.push_back(moment.second);
    }
    last_moments.clear();
    for (int g : which_groups) {
      const Range first = *active_in_groups[g].begin();
      active_in_groups[g].erase(active_in_groups[g].begin());
      position[first.i] = im_at;
      ErasePoint(g, first.b);
      if (!active_in_groups[g].empty()) {
        last_moments.insert({MinPoint(g), g});
      }
    }
    im_at++;
  };
  for (const RangeP& range : ranges) {
    while (!last_moments.empty() and last_moments.begin()->first < range.a) {
      collect();
    }
    const int g = range.p;
    if (active_in_groups[g].empty()) {
      last_moments.insert({MinPoint(g), g});
    }
    active_in_groups[g].insert(range);
    im_at = range.a;
  }
  while (!last_moments.empty()) {
    collect();
  }
}

bool ComputeGroups() {
  for (int i = 1; i <= m; i++) {
    if (!ComputeGroup(i)) {
      return false;
    }
  }
  return true;
}

int main() {
  scanf("%d%d", &n, &k);
  ranges.resize(n);
  for (int i = 0; i < n; i++) {
    RangeP& r = ranges[i];
    r.i = i;
    scanf("%d%d%d", &r.a, &r.b, &r.p);
  }
  std::sort(ranges.begin(), ranges.end(), [](const RangeP& a, const RangeP& b) {
                                            return a.p < b.p;
                                          });
  int next_i = 0;
  for (int i = 0; i < n; i++) {
    int p_value = ranges[i].p;
    next_i++;
    ranges[i].p = next_i;
    while (i + 1 < n and ranges[i + 1].p == p_value) {
      ranges[++i].p = next_i;
    }
  }
  m = next_i;
  for (int i = 0; i < n; i++) {
    group[ranges[i].p].push_back(ranges[i]);
  }
  if (!ComputeGroups()) {
    printf("NIE\n");
    return 0;
  }
  ComputeEverything();
  std::vector<int> all_positions;
  for (int i = 0; i < n; i++) {
    all_positions.push_back(position[i]);
  }
  std::sort(all_positions.begin(), all_positions.end());
  printf("%d\n", (int) (std::unique(all_positions.begin(), all_positions.end())
                            - all_positions.begin()));
  for (int i = 0; i < n; i++) {
    printf("%d\n", position[i]);
  }
  return 0;
}