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#include <cstdio>
#include <vector>
#include <list>
#include <stack>
using namespace std;

vector<int> degree;


struct PQ {
    vector<int> queue;
    vector<int> pos;
    int size;

    PQ(int n) {
        size = 0;
        queue.resize(n);
        pos.resize(n);
    }

    int parent(int i) {
        return (i - 1) / 2;
    }

    int left(int i) {
        return 2 * i + 1;
    }

    int right(int i) {
        return 2 * i + 2;
    }

    int empty() {
        return size == 0;
    }

    int top() {
        return queue[0];
    }

    int pop() {
        int topp = top();
        pos[topp] = -1;
        queue[0] = queue[--size];
        pos[queue[0]] = 0;
        heapify(0);
        return topp;
    }

    void dump() {
        for(int i = 0; i < size; ++i) {
            printf("idx=%d city=%d deg=%d pos=%d\n", i, queue[i], degree[queue[i]], pos[queue[i]]);
        }
    }

    int heapify(int i) {
        while(true) {
            int l = left(i), r = right(i), next = i;
            if(l < size && degree[queue[l]] < degree[queue[i]]) {
                next = l;
            }
            if(r < size && degree[queue[r]] < degree[queue[next]]) {
                next = r;
            }
            if(i != next) {
                int tmp = queue[i];
                pos[queue[i]] = next;
                pos[queue[next]] = i;
                queue[i] = queue[next];
                queue[next] = tmp;
                i = next;
            } else {
                break;
            }
        }
    }

    void insert(int val) {
        int i = size++;
        while(i > 0 && degree[queue[parent(i)]] > degree[val]) {
            queue[i] = queue[parent(i)];
            pos[queue[i]] = i;
            i = parent(i);
        }
        queue[i] = val;
        pos[val] = i;
    }

    void decrease_key(int val) {
        int i = pos[val];
        if(i >= 0) {
            --degree[val];
        } else {
            return;
        }
        while(i > 0 && degree[queue[parent(i)]] > degree[val]) {
            queue[i] = queue[parent(i)];
            pos[queue[i]] = i;
            i = parent(i);
        }
        queue[i] = val;
        pos[val] = i;
    }
};

int main() {
    int n, m, d;
    scanf("%d %d %d", &n, &m, &d);
    degree.resize(n, 0);
    PQ queue(n);
    vector<list<int> > adj;
    adj.resize(n);
    for(int i = 0; i < m; ++i) {
        int a, b;
        scanf("%d %d", &a, &b);
        ++degree[--a];
        ++degree[--b];
        adj[a].push_front(b);
        adj[b].push_front(a);
    }
    for(int i = 0; i < n; ++i) {
        queue.insert(i);
    }
    while(!queue.empty()) {
        int city = queue.pop();
        if(degree[city] < d) {
            for(list<int>::iterator it = adj[city].begin(); it != adj[city].end(); it++) {
                queue.decrease_key(*it);
            }
        } else {
            break;
        }
    }

    vector<int> group_start;
    vector<int> group_count;
    vector<int> group_id;
    group_id.resize(n, -1);
    for(int i = 0; i < n; ++i) {
        if(degree[i] < d || group_id[i] != -1) {
            continue;
        }
        group_start.push_back(i);
        group_id[i] = i;
        stack<int> st;
        st.push(i);
        int count = 1;
        while(!st.empty()) {
            int city = st.top();
            st.pop();
            for(list<int>::iterator it = adj[city].begin(); it != adj[city].end(); it++) {
                int nei = *it;
                if(degree[nei] < d || group_id[nei] != -1) {
                    continue;
                }
                group_id[nei] = i;
                ++count;
                st.push(nei);
            }
        }
        group_count.push_back(count);
    }

    int final_group = -1, max_group = 0;
    for(int i = 0; i < group_start.size(); ++i) {
        if(group_count[i] > 1 && group_count[i] > max_group) {
            final_group = i;
            max_group = group_count[i];
        }
    }
    if(final_group == -1) {
        printf("NIE\n");
    } else {
        int start = group_start[final_group];
        printf("%d\n", group_count[final_group]);
        for(int i = 0; i < n; ++i) {
            if(group_id[i] == start) {
                printf("%d ", i + 1);
            }
        }
        printf("\n");
    }

    return 0;
}