#include<iostream>
#include<math.h>
using namespace std;
int main()
{
	long long num, flag = 0;
	cin >> num;
	
	if(num == 0)
	{
		cout << num;
		return 0;
	}
	
	if(num < 0)
	{
		flag = 1;
		num = abs(num);
		cout << "-";
	}
	while(num > 0)
	{
		if(num % 10 != 0)
		{
			cout << num % 10;
		}
		num /= 10;
	}
	return 0;
}