#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)
#define FOR(i,b,e) for (int i=(int)(b); i<(int)(e); i++)
#define ALL(x) (x).begin(), (x).end()

const double PI = acos(-1);

bool check(long long x) {
  if (!x) return false;
  if (x % 100) return false;
  while (x % 10 == 0) {
    x /= 10;
  }
  return 1 <= abs(x) && abs(x) <= 9;
}

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  long long a, b;
  cin >> a >> b;

  if (check(a) && check(b)) {
    cout << a * b / 10 << endl;
  } else {
    long long c = a * b;
    if (-99999999 <= c && c <= 99999999)
      cout << c << endl;
    else
      cout << "E" << endl;
  }
  
  return 0;
}