func_code_string: #include <bits/stdc++.h>   using namespace std;   signed main() {     unsigned long long a, b;     cin >> a >> b;     if (a < b || (a % 2 != b % 2)) {       cout << -1 << endl;       return 0;     }     unsigned long long x = (a - b) / 2;     unsigned long long y = x + b;     cout << x <<     << y << endl;     return 0;   }   