#include <cstdio>
#include <cstdlib>
#include <cstddef>
#include <vector>
#include <algorithm>
#include <cmath>
#include <string>
#include <iostream>
#include <iomanip>
#define L64 long long
#define ASDF (1000000007LL)
#define MODADD(A, B) (A = (A + B) % ASDF)

bool isYuki(L64 v)
{
  v = std::abs(v);
  if(v < 100LL) return false;
  while(0 < v){
    L64 rem = v % 10LL;
    if(rem != 0 && 10LL <= v){
      return false;
    }
    v /= 10LL;
  }
  return true;
}

int main(void)
{
  L64 a, b;
  std::cin >> a >> b;
  if(isYuki(a) && isYuki(b)){
    std::cout << a * b / 10LL << std::endl;
  } else {
    L64 calc = a * b;
    if(99999999LL < std::abs(calc)){
      std::cout << "E" << std::endl;
    } else {
      std::cout << calc << std::endl;
    }
  }
  return 0;
}