简单的暴力

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in =new Scanner(System.in);
        String a=in.nextLine();
        int max=-1000000000;
        int num=0;
        char c=0;
        char[] b=new char[1010];
        b=a.toCharArray();
        for(int i='a';i<='z';i++){
            for(int j=0;j<a.length();j++){
                if(i==b[j]){
                    num++;
                }
                if(num>max){
                    max=num;
                    c=b[j];
                }
            }
            num=0;
        }
        System.out.println(c);
        System.out.println(max);
    }
}