题解 100% AC

#include <bits/stdc++.h>
using namespace std;
int main(){
    string a,b;
    getline(cin,a);
    getline(cin,b);
    if(a.length()!=b.size()){
    	cout<<"NO";
        return 0;
    }
    for(int i=0;i<a.length();i++){
    	if(a[i]>='A'&&a[i]<='Z') a[i]+=32;
        if(b[i]>='A'&&b[i]<='Z') b[i]+=32;
    }
    if(a==b) cout<<"YES";
    else cout<<"NO";
	return 0;
}