#include<iostream>

using namespace std;
 
 int main()

{
	
  int a,b,c,n;
	
  cin>>a;
	if(a<0) 
	{
	a=-a;
	c=-1;
	}
	else c=1;
	while(a!=0)
	{
		n=a%10;
		a=a/10;
		b=b*10+n;
	}
	b=b*c;
	cout<<b;
	return 0;
}