#include <bits/stdc++.h>
#define PI 3.14159265359
using namespace std;
const int64_t MOD = 1e9 + 7;

int main() {
	int64_t A, B;
	cin >> A >> B;

	string a, b;
	a = to_string(A);
	b = to_string(B);
	int64_t ans = A * B;

	if ((count(a.begin(), a.end(), '0') == a.size() - 1) &&
		(count(b.begin(), b.end(), '0') == b.size() - 1)) {
		ans /= 10;
	}
	else {
		if (ans / 100000000 != 0) {
			cout << "E" << endl;
			return 0;
		}
	}

	cout << ans << endl;
}