#include<iostream>
#include<algorithm>
#include <vector>
#include<cmath>
#include<iomanip>
#include<queue>
using namespace std;
typedef long long int lont;
int main() {
	int a, b;
	cin >> a >> b;
	int A, B;
	A = a;
	B = b;
	int ca = 0;
	int cb = 0;
	for (int ia = 0; ia < 20; ia++) {
		if (A % 10) {
			ca++;
		}
		A /= 10;
	}
	for (int ib = 0; ib < 20; ib++) {
		if (B % 10) {
			cb++;
		}
		B /= 10;
	}
	if (ca == 1 && cb == 1) {
		cout << a * b / 10 << endl;
	}
	else {
		if (a * b < -99999999 || a * b>99999999) {
			cout << 'E' << endl;
		}
		else {
			cout << a * b << endl;
		}
	}
}