题解 | #完美成绩#

import java.util.Scanner;
public class Main{
    public static void main(String []args){
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();
        int n = s.length();
        int a = 0;
        int b = 0;
        for(int i=0;i<n;i++){
            if(s.charAt(i)=='A'){
                a++;
            }
            if(s.charAt(i)=='B'){
                b++;
            }
        }
        if(a>b){
            System.out.print("A");
        }
        else if(a<b){
            System.out.print("B");
        }
        else{
            System.out.print("E");
        }
    }
}