import java.util.*;

public class Main {
	public static void main (String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		long a = sc.nextInt();
		long b = sc.nextInt();
		if (isBlind(a) && isBlind(b)) {
		    System.out.println(a * b / 10);
		} else if (a * b < -99999999 || a * b > 99999999) {
		    System.out.println("E");
		} else {
		    System.out.println(a * b);
		}
	}
	
	static boolean isBlind(long x) {
	    while (Math.abs(x) > 9) {
	        if (x % 10 != 0) {
	            return false;
	        }
	        x /= 10;
	    }
	    return true;
	}
}