#include <fstream.h>

void inorder (char [], int);
int main ()
{
	ifstream	input;
	char		filename[30];
	char		express[128];
	int			pos;

	cout << "Enter file spec: ";
	cin >> filename;
	input.open(filename);
	pos = 1;
	input.get(express[pos]);
	while (express[pos] != '\n')
	{
		pos++;
		input.get(express[pos]);
	}
	input.close();
	inorder (express, 1);
	cout << endl;
	return 0;
}

void inorder (char express[], int place)
{
	if (express[place] != '.')
	{
		inorder(express, place*2);
		cout << express[place] << ' ';
		inorder(express, place*2+1);
	}
}