import java.util.Scanner;
class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		char alpha = sc.next().charAt(0);
		System.out.println("? "+alpha+alpha);
		String returnType = sc.next();
		while(returnType.equals("?")){
			char c = sc.next().charAt(1);
			System.out.println("? "+c+alpha);
			returnType = sc.next();
		}
	}
}