A486.*a!=b？题解：

A486.a!=b

#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,b;
    cin >> a >> b;
    if(a!=b){//判断a和b是否相等，若不相等输出YES，若相等输出NO
        cout << "YES";
    }else cout << "NO";
    return 0;
}