#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

bool check(ll n) {
    if (n < 100) return false;
    while (n % 10 == 0) n /= 10;
    if (1 <= n && n <= 9) return true;
    return false;
}

int main() {
    ll a, b;
    cin >> a >> b;
    if (check(a) && check(b)) cout << a * b / 10 << endl;
    else {
        ll ans = a * b;
        if (-99999999 <= ans && ans <= 99999999) cout << ans << endl;
        else puts("E");
    }
    return 0;
}