// code for ABCHeck question
import java.util.*;
import java.io.*;

class Main {

    public static String ABCheck(String str) {
        str = str.toLowerCase(); // Make case insensitive
        for (int i = 0; i < str.length() - 4; i++) {
            if ((str.charAt(i) == 'a' && str.charAt(i + 4) == 'b') || 
                (str.charAt(i) == 'b' && str.charAt(i + 4) == 'a')) {
                return "true";
            }
        }
        return "false";
    }

    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        System.out.print(ABCheck(s.nextLine()));
    }
}