import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        long A = in.nextLong();
        long B = in.nextLong();

        int n = 0;
        int m = 0;

        long al = Math.abs(A);
        long bl = Math.abs(B);

        for(int i=0; al>=10; i++) {
            al /= 10;
            n++;
        }
        for(int i=0; bl>=10; i++) {
            bl /= 10;
            m++;
        }

        long ans = 0;
        if((n >= 2 && A % Math.pow(10,n) == 0) &&
           (m >= 2 && B % Math.pow(10,m) == 0)) {
            ans = A * B / 10;
        } else if(Math.abs(A*B) <= 99999999) {
            ans = A * B;
        } else {
            System.out.println("E");
            return;
        }

        System.out.println(ans);
    }
}