package test;

import java.util.Scanner;

public class main {
	public static void main (String[]args) {
		Scanner sc = new Scanner(System.in);
		long a = sc.nextLong();
		long b = sc.nextLong();
		solve(a,b);
	}

	static private void solve(long a, long b) {
		long ans = a * b;
		if(check(a) && check(b)) {
			System.out.println(ans/10);
		} else {
			if(ans >= -99999999 && ans <= 99999999) {
				System.out.println(ans);
			} else {
				System.out.println("E");
			}
		}
	}

	static private boolean check(long num) {
		while(num%10 == 0) {
			num /= 10;
		}
		num = Math.abs(num);
		if(num >= 1 && num <= 9) {
			return true;
		}
		return false;
	}
}