import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class practice {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String regex = "[^abc]";
        String example = "Abraha87m";

        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(example);

        String tiPrint = matcher.group(0).toString();
        System.out.print(tiPrint);

    }
}