#include <iostream>
#include <string>
int k;
using namespace std;
int main() {
    string s1,s2,s3;
    cin>>s1>>s2>>s3;
    k=(s2[0]-s1[0]+26)%26;
    for (int i=0;i<s3.size();i++) 
    {
        char c=s3[i];
        int idx=c-'A';
        idx=(idx-k+26)%26;
        s3[i]=idx+'A'; 
    }    
    cout<<s3; 
    return 0;
}

记得点赞