reversing a long sequence in c

I need to invert a sequence of numbers, for example, if I insert 1234, I print 4321. The code is working, but for entries of type 0123 or 1230 the zero is simply "deleted", but I needed zero was also displayed on the screen. I could not think or find a solution to this, can anyone help me?

int main()
{
    long n;
    long inverso;

    scanf("%ld",&n);

    do
    {
        inverso=n%10;
        printf("%ld",inverso);
        n/=10;

    }while(n>0);
    printf("\n");
    return 0;
}