#include <bits/stdc++.h>
using namespace std;
int main(){
  long long a,b;
  cin >>a>>b;
  if(a==0&&b==0){cout << 0 << endl;return 0;}
  long long c,d;
  c=abs(a);
  d=abs(b);
  while(c%10!=0)c/=10;
  while(d%10!=0)d/=10;
  if(abs(a)>=100&&abs(b)>=100&&c<10&&d<10){
    cout << a*b/10 << endl;
    return 0;
  }
  else if(a*b<=99999999&&a*b>=-99999999){
    cout << a*b << endl;
  }else cout << "E" << endl;
  return 0;
}