简单思路

#include<bits/stdc++.h>
using namespace std;
char y;
int main(){
cin >> y;
if(y=='Y'){
cout << "Yes";
}
if(y=='y'){
cout << "Yes";
}
if(y=='n'){
cout << "No";
}
if(y=='N'){
cout << "No";
}
return 0;
}