import java.util.*;
public class Main {
	public static void main(String[] args){
	    Scanner sc = new Scanner(System.in);
        String value = sc.next();
        int charValue = value.charAt(0);
        if((charValue >= 65 && charValue < 90) || (charValue >= 97 && charValue < 122)){
            String next = String.valueOf( (char) (charValue + 1));
            System.out.println(next);
        }
        else if(charValue == 90 || charValue == 122) {
            System.out.println(String.valueOf( (char) (charValue)));
        }
        else {
            System.out.println("Please input Character");
        }
        
	}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz