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

bool Chk( int N )
{
	if( N % 100 != 0 ) return false;

	N /= 100;
	while( N >= 10 )
	{
		if( N % 10 != 0 ) return false;

		N /= 10;
	}

	return true;
}

int main()
{
long long A;
long long B;
long long X;
	
	ios::sync_with_stdio( false );
	cin.tie( 0 );

	cin >> A;
	cin >> B;

	X = A * B;
	if( Chk( abs( A ) ) && Chk( abs( B ) ) )
	{
		cout << X / 10 << endl;

		return 0;
	}

	if( - 99999999 <= X && X <= 99999999 )
		cout << X << endl;
	else
		cout << "E" << endl;

	return 0;
}