#include <iostream>
#include <algorithm>
#include <vector>

using namespace std;

bool ansan(int n) {
  n = abs(n);
  if (n < 100) return false;
  while (n % 10 == 0) {
    n /= 10;
  }
  return n < 10;
}

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