int main()
{
	int num,a,b,c,d;       //??????????10000??????????????
	cin>>num;
	a=num/1000;          //??????
	b=(num-a*1000)/100;   //??????
	c=(num-a*1000-b*100)/10;   //??????
	d=num-a*1000-b*100-c*10;   //??????
	if(a!=0)
		cout<<d<<c<<b<<a<<endl;    //??????
	else if(a==0&&b!=0)
		cout<<d<<c<<b<<endl;   //??????
	else if(a==0&&b==0&&c!=0)
		cout<<d<<c<<endl;   //??????
	else cout<<d<<endl;   //??????
	return 0;
}
