#include<stdio.h>
int main(void)
{
	long N;
	long t,T;
	int m;

    scanf("%ld", &N);
	
		m = 1;
		if (N < 0)
		{
			N = -N;
			m = 0;
		}
		
		t = N % 10;
		T = N / 10;
        
		if (m == 0)
			printf("-");
		while (T != 0)
		{
			if (t != 0)
				printf("%ld", t);

			t = T % 10;
			T = T / 10;
		}
		printf("%ld\n", t);
	
	return 0;
}