#include <bits/stdc++.h>
#define rep(i,n) for (int i=0; i<(n); ++i)
using namespace std;
using ll=long long;
int main(){
    ll a,b;
    cin>>a>>b;
    if(a%10==0&&b%10==0){
        cout<<a*b/10<<endl;
    }
    else{
        string s=to_string(a*b);
        if(s.length()>=9){
            cout<<"E"<<endl;
        }
        else{
            cout<<a*b<<endl;
        }
    }
}