Java 代码

import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        String s = in.nextLine();
        int[] a = new int[26];
        int max = 0;
        int z = 0;
        for (int i = 0; i < s.length(); i++) {
            int j = s.charAt(i) - 97;
            a[j]++;
        }
        for(int i = 0;i < a.length;i++){
            if(a[i] > max){
                max = a[i];
                z = i;
            }
        }
        System.out.println((char)(z + 97));
        System.out.println(max);
    }
}