import java.io.BufferedReader;
import java.io.InputStreamReader;
public class Main {
public static void main(String[] args) throws Exception {
BufferedReader bfr=new BufferedReader(new InputStreamReader(System.in));
String strtemp=bfr.readLine();
for(int i =0; i < strtemp.length(); i++){
if(strtemp.charAt(i) == 'z'){
System.out.print('a');
}
else{
System.out.print((char)(strtemp.charAt(i) + 1));
}
}
}
}