import java.util.Scanner;

public class No632 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a[] = new int[3];
		int b[] = new int[3];
		
		for(int i = 0;i < 3;i++) {
			String c = sc.next();
			if(c.equals("?")) {
				a[i] = 1;
				b[i] = 4;
			}else {
				a[i] = Integer.parseInt(c);
				b[i] = Integer.parseInt(c);
			}
		}
		
		if((a[1] < a[0] && a[1] < a[2]) || (a[1] > a[0] && a[1] > a[2])) {
			System.out.print(1);
		}
		if((b[1] < b[0] && b[1] < b[2]) || (b[1] > b[0] && b[1] > b[2])) {
			System.out.print(4);
		}
		System.out.println();
	}
}