#include <iostream>
using namespace std;
int main()
{
	long long n;
	cin >> n;
	if (n == 0)cout << 0;
	for(long long j = n; j!=0;)
	{
		if (j % 10 != 0)
		{
			cout << j % 10;
		}
		else {
			if (j < 0)cout << "-";
		}
		if (j < 0)j = abs(j / 10);
		else j = j / 10;
	}
	return 0;
}