#include<iostream>
#include<algorithm>
#include <vector>
#include<cmath>
#include<iomanip>
#include<queue>
using namespace std;
typedef long long int lint;
int main() {
	lint A, B;
	cin >> A >> B;
	lint a = A;
	lint b = B;
	lint cnta = 0;
	lint cntaa = 0;
	while (a) {
		if (a % 10) {
			cnta++;
		}
		a /= 10;
		cntaa++;
	}
	lint cntb = 0;
	lint cntbb = 0;
	while (b) {
		if (b % 10) {
			cntb++;
		}
		b /= 10;
		cntbb++;
	}
	if (cnta == 1 && cntb == 1 && cntaa <= 3 && cntbb <= 3) {
		cout << A * B / 10 << endl;
	}
	else {
		if (A * B < -99999999 || A * B>99999999) {
			cout << 'E' << endl;
		}
		else {
			cout << A * B << endl;
		}
	}
}