#include<stdio.h>
#include<string>
using namespace std;

bool isPalindrome(string s){
    int i=0; j=s.length()-1;
    while(i<j){
        if(s[i]!=s[j])
        i++;
        j--;
    }
    return true;
}
int main{
    string num1, num2;
    cin>>num1>>num2;
    
    if(isPalindrome(num1) && isPalindrome(num2)) {
        long long a = stoll(num1);
        long long b = stoll(num2);
        cout << a*b;
    } else {
        cout <<"Invalid input";
    }
    return 0;
    
}