#include<iostream>
#include<string>
using namespace std;
int main()
{
	long n;
	cin >> n;
	string s = to_string(n);
	int m = s.size();
	if (n < 0)
		cout << '-';
	else if (n == 0)
		cout << 0;
	for (int i = m-1; i >=0; i--)
	{
		
		if (s[i] != '0' && s[i] != '-')
			cout << s[i];
	}
	return 0;
}