func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int l, r;     cin >> l >> r;     long long int mid = (r - l + 1) / 2;     cout <<  YES  << endl;     while (mid--) {       if (r >= l) {         cout << l <<     << l + 1 << endl;         l = l + 2;       }     }   }   