#define _CRT_SECURE_NO_WARNINGS 1
#include <math.h>
#include <stdio.h>
int main()
{
	int n,x,a,i=0, sum = 0,b,c;
	scanf("%d", &n);
	/*求+-号*/
	x = n > 0 ? 1 : -1;
	n = fabs(n);
	c = n;
	while (c!= 0)
	{
		c /= 10;
		i++;
	}
	for (int j = i - 1; j >= 0; j--)
	{
		a = n % 10;
		n /= 10;
		sum +=a*pow(10, j);
	}
	printf("%d\n",sum*x);
	return 0;
}