#include <iostream>
using namespace std;

void write_vertical(int n);

int main()
{
    int n;
    
    cout << "Recursion" << endl
        << "Enter a number with one or more digits: ";
    cin >> n;
    cout << "--------------------------------------" << endl;
    write_vertical(n);
    
    return 0;
}

void write_vertical(int n)
{
    if (n < 10)
    {
        cout << n << endl;
    }
    else
    {
        write_vertical(n / 10);
        cout << (n % 10) << endl;
    }
}