#include <iostream>
#include <math.h>
#include <string>
#include <algorithm>
#include <sstream>
#include <iomanip>

typedef long long ll;
#define MIN(x, y) (x < y ? x : y)
#define MAX(x, y) (x > y ? x : y)

using namespace std;

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

	if(A % 10 == 0 && B % 10 == 0){
		cout << A * B / 10 << endl;
	} else {
		ll ans = A * B;
		if(ans > 99999999 || ans < -99999999){
			cout << "E" << endl;
		} else {
			cout << ans << endl;
		}
	}
}