func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int a, b;     cin >> a >> b;     while (1) {       if (a >= (2 * b)) {         a = a % (2 * b);       } else if (b >= (2 * a))         b = b % (2 * a);       else         break;       if ((a == 0 || b == 0)) break;     }     cout << a <<     << b << endl;   }   