Java 代码

import java.util.Scanner;

public class Main
{
    public static void main(String[] args)
    {
        Scanner cin = new Scanner(System.in);

        String s = cin.nextLine();

        char[] sa = s.toCharArray();
        for (int i = 0; i < sa.length; i ++)
        {
            char x = sa[i];
            if (x == 'z')
                sa[i] = 'a';
            if (x == 'Z')
                sa[i] = 'A';
            if ( (x >= 'a' && x < 'z') || (x >= 'A' && x < 'Z'))
                sa[i] = (char)((int)x + 1);
        }

        System.out.println (String.valueOf(sa));
    }
}