int main()
{
	int n,a,b,c,d,e,result;           //???????n?????????a,b,c,d,e?????result???
	cin>>n;                           //??n
	e=n%10;
	d=(n%100-e)/10;
	c=(n%1000-d*10-e)/100;
	b=(n%10000-c*100-d*10-e)/1000;
	a=(n-n%10000)/10000;              //????n?????????
	if(n>10000)  result=e*10000+d*1000+c*100+b*10+a;
	else if(n>1000) result=e*1000+d*100+c*10+b;
	else if(n>100) result=e*100+d*10+c;
	else if(n>10) result=e*10+d;
	else result=e;                   //????n???????????
	cout<<result<<endl;              //??????
	return 0;
}