import java.util.*;
import java.io.*;
public class Cipher{
public String encode(String s, int offset){
String ans = "";
//not changing s directly in case we need s again
String sLower = s.toLowerCase();
for(int i = 0; i < sLower.length() ; i++){
if ((sLower.charAt(i) < 'a')|| (sLower.charAt(i)>'z')){
ans = ans + sLower.charAt(i);
}
else{
if(sLower.charAt(i) + offset <= 'z')
ans = ans + (char)(sLower.charAt(i) + offset);
else
ans = ans + (char)('a' + (offset - ('z' - sLower.charAt(i))));
}
}
return ans;
}
}