题解 | #竞选社长#

import java.util.Scanner;
public class Main {
    
    public static void main(String[] args) {
        
        Scanner sc = new Scanner(System.in);
        String str = sc.next();
        int counta = 0;
        int countb = 0;
        for(int i = 0 ; i < str.length() ; i++) {
            if(str.charAt(i) == 'A') {
                counta++;
            } else if(str.charAt(i) == 'B') {
                countb++;
            }
        }
        if(counta > countb) {
            System.out.println("A");
        } else if(counta == countb) {
            System.out.println("E");
        } else {
            System.out.println("B");
        }
    }
}