ex1a_tema_19.11.2019.cpp

#include<iostream>
using namespace std;
int main()
{
    int n,n2,p;
    cin>>n;
    n2=0;
    p=1;
    while(n!=0)
    {
        if(n%10<=5)
        {
          n2=n2+(n%10)*p;
          p=p*10;
        }
        n=n/10;
    }
    cout<<n2;
    return 0;
}