import java.util.*;
public class tvim {
        static Scanner input=new Scanner(System.in);
        public static void main(String[] args) {

                char First,Second;
                System.out.println("Put the Letter ");
                First=input.next().charAt(0);
                Second=(char)(First +1);
                if(First=='z'){
                        System.out.println("A");
                }else{
                        System.out.println(Second);

        }}

}