不会的看我！！！

#include <bits/stdc++.h>
using namespace std;
string s,k;
int len;
int main(){
	cin>>k;
	len=k.size();
	for(int i=0;i<=len-1;i++)
		if(k[i]>='a' and k[i]<='z') 
			k[i]=k[i]-32;

	cin>>s;
	for(int i=0;i<=s.size()-1;i++){
		if(s[i]>='a' and s[i]<='z'){
			int x = s[i]-'a';
			int y = k[i%len]-'A';
			s[i] = (x-y+26)%26+'a';
		}
		else if(s[i]>='A' and s[i]<='Z'){
			int x = s[i]-'A';
			int y = k[i%len]-'A';
			s[i] = (x-y+26)%26+'A';
		}
	}
	for(int i=0;i<=s.size()-1;++i){
		cout<<s[i];
	}
	return 0;
}