func_code_string: #include <bits/stdc++.h>   using namespace std;   const double PI = acos(-1.0);   const int maxn = 1e5 + 5;   const int Inf = 1e9 + 7;   int main() {     int a, b;     while (cin >> a >> b) {       if (a == 0 && b == 0) {         printf( NO n );       } else if (abs(a - b) <= 1) {         printf( YES n );       } else {         printf( NO n );       }     }     return 0;   }   