//?????(???5?)?????????????123???321
//???????5?????????????????0??
//?????????
int main()
{
	int n,a,b,c,d,e,m;                      //n??????a?b?c?d?e???n????????????m?n?????
	cin>>n;                                 //???n
	if(9999<n&n<=99999)                     //n?5???
	{
		e=n/10000;                          //????
		d=(n-e*10000)/1000;                 //????
		c=(n-e*10000-d*1000)/100;           //????
		b=(n-e*10000-d*1000-c*100)/10;      //????
		a=n-e*10000-d*1000-c*100-b*10;      //????
		m=e+10*d+100*c+1000*b+10000*a;      //??????
		cout<<m;                            //????
	}
	else if(999<n&n<=9999)                  //n?????
	{
		d=n/1000;
		c=(n-d*1000)/100;
		b=(n-d*1000-c*100)/10;
		a=n-d*1000-c*100-b*10;
		m=d+10*c+100*b+1000*a;
		cout<<m;
	}
	else if(99<n&n<=999)                    //n?????
	{
		c=n/100;
		b=(n-c*100)/10;
		a=n-c*100-b*10;
		m=c+10*b+100*a;
		cout<<m;
	}
	else if(n<=99&n>9)                      //n?????
	{
		b=n/10;
		a=n-10*b;
		m=b+10*a;
		cout<<m;
	}
	else if(n<=9)cout<<n;                   //n?????
	return 0;
}