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#include <cstdio>

int bits(int v) {
  int r = 0;
  for (; v > 0; v >>= 1) {
    r += (v & 1);
  }
  return r;
}

int abs(int x) {
  if (x < 0) {
    return -x;
  } else {
    return x;
  }
}

// 3 -> a
// 4 -> c
// 5 -> g
// 6 -> w
char letters[] = "###acgw";
char str[1000000];

int choose(int ones, int N) {
  int min_diff = N << 3;
  int min = 0;
  for (int i = 3; i <= 6; ++i) {
    int diff = abs(i * N - ones);
    if (diff < min_diff) {
      min_diff = diff;
      min = i;
    }
  }
  return min;
}

int main() {
  int N, ones = 0;

  scanf("%d%s", &N, str);

  for (char *x = str; *x; ++x) {
    if (*x == '1') {
      ++ones;
    }
  }

  if (ones < 3 * N || ones > 6 * N) {
    printf("NIE\n");
  } else {
    for (; N > 0; --N) {
      int chosen = choose(ones, N);
      ones -= chosen;
      printf("%c", letters[chosen], N);
    }
    printf("\n");
  }
  return 0;
}