#include<bits/stdc++.h>
using namespace  std;
int my;
string s1,s2,s3;
int  main( ) 
{
    cin>>s1>>s2>>s3;
    my=int(s2[0]-s1[0]);
    my=(my+26)%26;
    for (int i=0;i<=s3.size()-1;i++)
    {
        s3[i]-=my;
        if (s3[i]<'A')
            s3[i]=s3[i]+26;
    }
    cout<<s3;
    return 0;   
}
    

#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;
}

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