pb28

#include <iostream>

using namespace std;

int main()
{
    unsigned n,nrpar=0,nrimp=0,rang=0,nr;
    cout<<"n=";cin>>n;

    while (n!=0)
    {
        rang++;
        if (rang%2==0)
            nrpar=nrpar*10+n%10;
        else
            nrimp=nrimp*10+n%10;
        n/=10;
    }

    int invnrimp=0,copynrpar=nrpar,p=1;
    while (copynrpar!=0)
    {

          p*=10;
        copynrpar/=10;
    }


    while (nrimp!=0)
    {
        invnrimp=invnrimp*10+nrimp%10;
        nrimp/=10;
    }



   nr=invnrimp*p+nrpar;
   cout<<"noul nr e: "<<nr;
    return 0;
}