import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.*;
 
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String regularExpression = "(A+)+";
        String data =
                "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAB";
        Pattern p = Pattern.compile(regularExpression, Pattern.CANON_EQ | Pattern.CASE_INSENSITIVE);
        System.out.println(p.matcher(data).matches());
	}
}

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