#include<stdio.h>

int main()
{
	int n, m;
	char flag = '-';
	scanf("%d", &n);
	int t = n;
	while(t){
		int temp = t % 10;
		m = m * 10 + temp;
		t /= 10;
	}
	if(n) 	printf("%d", m);
	else	printf("%c%d",flag,m);
	
	return 0;
}