func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int a, b;     while (cin >> a >> b) {       if (a == 0 && b == 0)         cout <<  NO  << endl;       else {         if (abs(a - b) == 1 || a == b)           cout <<  YES  << endl;         else           cout <<  NO  << endl;       }     }     return 0;   }   