#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <stdio.h>
#include <cstring>
#include <queue>
#include <stack>
#include <functional>
#include <math.h>
#include <iomanip>
using namespace std;
#define Would
#define you
const int INF = 999999999;
const int MOD = 1e9 + 7;
const double pi = 3.141592653589793238;

int main() {
	long long a, b;
	cin >> a >> b;
	if (a % 10 == 0 && b % 10 == 0 && a != 10 && b != 10) {
		cout << a * b / 10 << endl;
	}
	else {
		if (-99999999 <= a * b&&a*b <= 99999999) { cout << a * b << endl; }
		else { cout << "E" << endl; }
	}
}