#include<bits/stdc++.h>

using namespace std;

string s1,s2,s3;

int main(){

cin>>s1>>s2>>s3;

int n=s2[0]-s1[0];

for(int i=0;i<s3.size();i++){

	char ch;

	ch=(s3[i]-n);


	if(ch>='A'&&ch<='Z') 

cout<<ch;

	else if(ch<'A'){

		ch+=26;
  
		cout<<ch;
  
	}else{

		ch-=26;
  
		cout<<ch;
  
	}

}

return 0;

}