#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define F first
#define S second
#define pii pair<int, int>
#define eb emplace_back
#define all(v) v.begin(), v.end()
#define rep(i, n) for (int i = 0; i < n; ++i)
#define rep3(i, l, n) for (int i = l; i < n; ++i)
#define chmax(a, b) a = max(a, b)
#define chmin(a, b) a = min(a, b)
#define out(a) cout << a << endl
#define outa(a, n) rep(_, n) cout << a[_] << " "; cout << endl
#define SZ(v) (int)v.size()
#define inf (int)(1e9+7)

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    long long a, b;
    cin >> a >> b;
    string s = to_string(a), t = to_string(b);
    int ss = SZ(s), tt = SZ(t);
    rep(i, SZ(s)) {
        if (s[i] == '0') {
            s = s.substr(0, i);
            break;
        }
    }
    rep(i, SZ(t)) {
        if (t[i] == '0') {
            t = t.substr(0, i);
            break;
        }
    }
    if (ss - SZ(s) >= 2 && tt - SZ(t) >= 2 && 1 <= abs(stoi(s)) && abs(stoi(s)) <= 9 && 1 <= abs(stoi(t)) && abs(stoi(t)) <= 9) {
        cout << a * b / 10 << endl;
    } else {
        long long tmp = a * b;
        if (-99999999 <= tmp && tmp <= 99999999) {
            cout << tmp << endl;
        } else {
            cout << "E" << endl;
        }
    }
}