#include<iostream>
using namespace std;

int main() {
	long long N;
	cin >> N;
	while (N!=0)
	{
		int a = N% 10;
		if (a > 0)
		{
			cout << a;
		}
		else if (a < 0)
		{
			cout << a;
			N = -N;
		}
		N /= 10;
	}
	








	system("pause");
	return 0;
}