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

using i32 = int32_t;using i64 = int64_t;using u32 = uint32_t;using u64 = uint64_t;using f32 = float;using f64 = double;using f80 = long double;
using i128 = __int128_t;using u128 = __uint128_t;
using vi32 = vector<i32>;using vi64 = vector<i64>;using vu32 = vector<u32>;using vu64 = vector<u64>;
using vvi32 = vector<vector<int32_t>>;using vvi64 = vector<vector<int64_t>>;using vvu32 = vector<vector<uint32_t>>;using vvu64 = vector<vector<uint64_t>>;
using pi32 = pair<i32,i32>;using pi64 = pair<i64,i64>;using Pu32 = pair<u32,u32>;using Pu64 = pair<u64,u64>;
using vpi32 = vector<pi32>;using vpi64 = vector<pi64>;using vpu32 = vector<Pu32>;using vpu64 = vector<Pu64>;

int main() {
  i64 A, B;
  cin >> A >> B;
  string s, t;
  s = to_string(A);
  t = to_string(B);
  i64 ans = A * B;
  auto check = [](i64 n) -> bool {
    int cnt = 0, sz = 0;
    while(n) {
      int m = n % 10;
      cnt++;
      if (!m) sz++;
      n /= 10;
    }
    if ((sz + 1 == cnt) && (sz > 1)) return true;
    else return false;
  };
  if (check(A) && check(B)) ans /= 10;
  else {
    if (ans / 100000000 != 0) {
      cout << "E" << endl;
      return 0;
    }
  }
  cout << ans << endl;
  return 0;
}