#include<stdio.h>
int main()
{
    char num1[1001];
    char num2[1001];
    if(scanf("%s %s",num1,num2)!=0)
    {
        return 1;
    }
    if(isPalindrome(num1)&& isPalindrome(num2))
    {
        long long n1=atoll(num1);
        long long n2=atoll(num2);
        long long product=n1*n2;
        printf("%lld\n",product);
    }
    else 
    {
        printf("Invalid input");
    }
    return 0;
}