#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;

ll A, B;

int main() {
  cin >> A >> B;
  ll a = A, b = B, n = 0, m = 0;
  while (a != 0 && a % 10 == 0) {
    a /= 10;
    n++;
  }
  while (b != 0 && b % 10 == 0) {
    b /= 10;
    m++;
  }
  if (n >= 2 && m >= 2 && 1 <= abs(a) && abs(a) <= 9 && 1 <= abs(b) && abs(b) <= 9) cout << A * B / 10 << endl;
  else {
    if (-99999999 <= A * B && A * B <= 99999999) cout << A * B << endl;
    else cout << 'E' << endl;
  }
  return 0;
}