#include <iostream>
using namespace std;
int main()
{
    int a,b=0;
     cout<<"Enter number: \n";
     cin>>a;
        while(a)
        {
                if(a%10!=3 and a%10!=6)
                b=b*10+a%10;
                a/=10;
        }
        while(b)
        {
                a=a*10+b%10;
                b/=10;
        }
        cout<<a<<"\n";
return 0;
}