// uses the iterative function write_vertical
// Walter Savitch
// 12/4/2001

#include <iostream>

using std::cin; using std::cout; using std::endl;

void write_vertical(int n); // writes digits of n one per line


int main() {
  cout << "Enter number: ";
  int num;
  cin >> num;
  write_vertical(num);
}

// n is written to the screen vertically
// with each digit on a separate line.  
void write_vertical(int n) {

    int tens = 1;
    int leftpc = n;

    // tens is a power of ten that has the same number of
    // digits as n. For example, if n is 2345, 
    // then tens is 1000.
    while (leftpc > 10){
        leftpc = leftpc/10;
        tens *= 10;
    }

    for (int power = tens; power > 0; power = power/10){
        cout << (n/power) << endl;
        n = n%power;
    }
}