#include<iostream>

using namespace std;

int length(const char *a)
{
	int i = 0;
	while (a[i])
		i++;
	return i;
}
bool isLetter(const char c)
{
	if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'))
		return true;
	return false;
}
int wordCount(const char *a)
{
	int i = 0, temp = 0, count = 0;
	while (i < length(a))
	{
		if (isLetter(a[i]))
			temp++;
		else if (temp>0)
		{
			temp = 0;
			count++;
		}
		i++;
	}
	if (temp > 0)
		count++;
	return count;
}
void copy(char *a, const char *b)
{
	int i;
	for (i = 0; i < length(b); i++)
		a[i] = b[i];
	a[i] = '\0';
}
void copy2(char *a, const char *b)
{
	a[0] = (char)(b[0] + 32);
	int i;
	for (i = 1; i < length(b); i++)
	{
		a[i] = b[i];
	}
	a[i] = '\0';
}
int compareLex(const char *a, const char *b)
{
	int i = 0, check = 0;
	char *tempA = new char[length(a) + 1];
	char *tempB = new char[length(b) + 1];
	if (a[i] >= 'A' && a[i] <= 'Z')
	{
		copy2(tempA, a); check++;
	}
	if (b[i] >= 'A' && b[i] <= 'Z')
	{
		copy2(tempB, b);
		if (check == 0)check = 2;
		else if (check == 1)check = 3;
	}
	if (check == 0)
	{
		while (a[i] && b[i] && a[i] == b[i])
			i++;
		delete[] tempA;
		delete[] tempB;
		return a[i] - b[i];
	}
	else if (check == 1)
	{
		while (tempA[i] && b[i] && tempA[i] == b[i])
			i++;
		delete[] tempB;
		return tempA[i] - b[i];
	}
	else if (check == 2)
	{
		while (a[i] && tempB[i] && a[i] == tempB[i])
			i++;
		delete[] tempA;
		return a[i] - tempB[i];
	}
	else
	{
		while (tempA[i] && tempB[i] && tempA[i] == tempB[i])
			i++;
		return tempA[i] - tempB[i];
	}
}
void sort(char **arr, int count)
{
	int maxIndex = 0;
	char *max = new char[500];
	for (int i = 0; i < count - 1; i++)
	{
		copy(max, arr[i]);
		maxIndex = i;
		for (int j = i + 1; j < count; j++)
		{
			if (compareLex(max, arr[j]) < 0)
			{
				copy(max, arr[j]);
				maxIndex = j;
			}
		}
		copy(arr[maxIndex], arr[i]);
		copy(arr[i], max);
	}
}
void print(char **arr, int n)
{
	for (int i = 0; i < n - 1; i++)
	{
		int check = 0;
		for (int j = i + 1; j < n; j++)
		{
			if (compareLex(arr[i], arr[j]) == 0)
			{
				check++;
			}
		}
		if(check==0)
		{
			cout << arr[i] << endl;
		}
		if (i == n - 2)cout << arr[i + 1] << endl;
	}
}
int main()
{
	int n;
	do
	{
		cin >> n;
	} while (n < 1 || n>500);
	cin.ignore();
	char *text = new char[n + 2];
	cin.getline(text, n + 1);
	int wCount = wordCount(text);
	char **arr = new char*[wCount];
	for (int i = 0; i < wCount; i++)
	{
		arr[i] = new char[n];
	}
	int indexA = 0, indexT = 0;
	char *temp = new char[n]; int indexTemp = 0;
	while (indexT < n)
	{
		while (isLetter(text[indexT]))
		{
			temp[indexTemp] = text[indexT];
			indexTemp++;
			indexT++;
		}
		temp[indexTemp] = '\0';
		copy(arr[indexA], temp);
		indexA++;
		indexT++;
		indexTemp = 0;
	}
	sort(arr, wCount);
	print(arr, wCount);
	system("pause");
	return 0;
}