Duplicare1

void duplicare(int n,int &d)
{
    d=0;
    int ok=0,p=1;
    while(n)
    {
	    d=n%10*p+d;
	    p*=10;
	    if(n%2==0)
	        ++ok,d=n%10*p+d,p*=10;
	    n/=10;
    }
    if(!ok)
	    d=-1;
}