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

int main() {
	int a, tag, ans;
	cin >> a;

	if (a == 0) {
		cout << a;
		return 0;
	} else if (a < 0) {
		tag = 1;
	} else {
		tag = 0;
	}
	while (a != 0) {
		ans = ans * 10 + a % 10;
		a /= 10;
	}

	if (tag == 1) {
		cout << -abs(ans);
	} else {
		cout << abs(ans);
	}
	return 0;
}