func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);     long long a, b;     cin >> a >> b;     cout <<  YES  << endl;     for (long long i = a; i <= b; i += 2) cout << i <<     << i + 1 << endl;     return 0;   }   