int calcul(int n, int &x)
{
while(n)
{
    int p=1, x=0;
    if((n%10)%2==0)
    {
        x=x+(n%10)*p;
        p=p*10;
    }
    n=n/10;
}
}

int main()
{
    int x;
    calcul(9278,x);
    cout<<x;

}