#include<bits/stdc++.h>
#define maxv 5550
using namespace std;
string A, B;
int a[maxv], b[maxv], res[maxv];
void solve() {
	cin >> A >> B;
	int lena = A.length(), lenb = B.length();
	for (int i = lena - 1; i >= 0; i--) {
		a[lena-i] = A[i] - '0';
	}
	for (int i = lenb - 1; i >= 0; i--) {
		b[lenb - i] = B[i] - '0';
	}
	//正序 1开始
	for (int i = 1; i <= lena; i++) {
		for (int j = 1; j <= lenb; j++) {
			res[i + j - 1] += a[i] * b[j];
		}
	}
	//进位
	for (int i = 1; i <= lena + lenb; i++) {		
		res[i + 1] +=res[i] / 10;
		res[i] %= 10;
	}
	int len = lena + lenb;
	for (; res[len] == 0;len--) {
	}
	for (int i = len; i >=1; i--) {
		cout << res[i];
	}
	
}

int main(){
	std::ios::sync_with_stdio(false);
	std::cin.tie(0); std::cout.tie(0);
	solve();
}