#include <iostream>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <cstdio>
#include <cstring>
#include <math.h>
using namespace std;
typedef long long ll;
typedef double D;
typedef pair<int,int> P;
#define M 1000000007
#define F first
#define S second
#define PB push_back
ll a,b;
int main(void){
    cin>>a>>b;
    ll c=a,d=b;
    while(c!=0&&c%10==0)c/=10;
    while(d!=0&&d%10==0)d/=10;
    if(0<abs(c)&&abs(c)<10&&0<abs(d)&&abs(d)<10&&abs(a)>99&&abs(b)>99){
        cout<<a*b/10<<endl;
    }else if(-99999999<=a*b&&a*b<=99999999)cout<<a*b<<endl;
    else cout<<"E\n";
}