func_code_string: #include <bits/stdc++.h>   using namespace std;   int a[100000];   bool b[100000];   int c[3][100000 / 3];   int main() {     int n;     while (cin >> n) {       memset(a, 0, sizeof(a));       memset(b, true, sizeof(b));       bool flag = true;       int sum1 = 0;       int sum2, sum3;       sum2 = sum3 = 0;       for (int i = 0; i < n; i++) {         cin >> a[i];         if (a[i] == 5 || a[i] == 7) flag = false;         if (a[i] == 1) sum1++;         if (a[i] == 2 || a[i] == 3) sum2++;         if (a[i] == 4 || a[i] == 6) sum3++;       }       if (sum1 != n / 3 || sum2 != n / 3 || sum3 != n / 3) flag = false;       if (!flag)         cout <<  -1  << endl;       else {         sort(a, a + n);         for (int i = 0; i < n / 3; i++) {           c[0][i] = a[i];           c[1][i] = a[i + n / 3];           c[2][i] = a[i + 2 * n / 3];           if (c[1][i] == 3 && c[2][i] == 4) flag = false;         }         if (flag) {           for (int i = 0; i < n / 3; i++)             cout << c[0][i] <<     << c[1][i] <<      << c[2][i] << endl;         } else           cout <<  -1  << endl;       }     }     return 0;   }   