func_code_string: #include <bits/stdc++.h>   using namespace std;   void exgcd(int a, int b, int *x, int *y) {     if (b) {       exgcd(b, a % b, y, x);       (*y) = (*y) - (a / b) * (*x);     } else       *x = 1, *y = 0;   }   int main() {     std::ios::sync_with_stdio(false);     double r1, r2, c1, c2, d1, d2;     cin >> r1 >> r2 >> c1 >> c2 >> d1 >> d2;     double a, b, c, d;     b = (r1 + c2 - d1) / 2.0;     a = r1 - b;     d = c2 - b;     c = d2 - b;     if ((int)a == a && (int)b == b && (int)c == c && (int)d == d && a + b == r1 &&         c + d == r2 && a + d == d1 && c + b == d2 && a + c == c1 && b + d == c2) {       set<int> temp;       temp.insert(a);       temp.insert(b);       temp.insert(c);       temp.insert(d);       if (temp.size() == 4 && *(temp.begin()) > 0 && *(temp.rbegin()) < 10) {         cout << (int)a <<     << (int)b << endl;         cout << (int)c <<     << (int)d << endl;       } else         cout << -1;     } else       cout << -1;   }   