int main ()
{ int n,a[4];//???????
cin>>n;//???
if(n==10000)
	cout<<"00001"<<endl;//?????????10000??????
else
{a[1]=n/1000;//???
a[2]=(n-1000*a[1])/100;//???	
a[3]=(n-1000*a[1]-100*a[2])/10;//???
a[4]=(n-1000*a[1]-100*a[2]-10*a[3]);}//???
if (a[1]!=0)cout<<a[4]<<a[3]<<a[2]<<a[1]<<endl;//?????????????????????
else{if (a[2]!=0)cout<<a[4]<<a[3]<<a[2]<<endl;
     else
	   {if (a[3]!=0)cout<<a[4]<<a[3]<<endl;
	    else cout<<a[4]<<endl;
       }
    }
return 0;
}