Problem:
Score : 200 points

Problem Statement

In Japan, people make offerings called hina arare, colorful crackers, on March 3.

We have a bag that contains N hina arare. (From here, we call them arare.)

It is known that the bag either contains arare in three colors: pink, white and green, or contains arare in four colors: pink, white, green and yellow.

We have taken out the arare in the bag one by one, and the color of the i-th arare was S_i, where colors are represented as follows - pink: P, white: W, green: G, yellow: Y.

If the number of colors of the arare in the bag was three, print Three; if the number of colors was four, print Four.

Constraints

1 \leq N \leq 100

S_i is P, W, G or Y.

There always exist i, j and k such that S_i=P, S_j=W and S_k=G.

Input

Input is given from Standard Input in the following format:

N
S_1 S_2 ... S_N

Output

If the number of colors of the arare in the bag was three, print Three; if the number of colors was four, print Four.

Sample Input 1

6
G W Y P Y W

Sample Output 1

Four

The bag contained arare in four colors, so you should print Four.

Sample Input 2

9
G W W G P W P G G

Sample Output 2

Three

The bag contained arare in three colors, so you should print Three.

Sample Input 3

8
P Y W G Y W Y Y

Sample Output 3

Four

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.Scanner;
import java.util.Random;
import java.util.Arrays;
import java.util.Comparator;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.HashMap;
import java.time.*;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;

public class Main {
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		ArrayList<String> list = new ArrayList<String>();
		int n = sc.nextInt();
		String[] s = new String[n];
		
		for (int i = 0; i < n; i++) {
			s[i] = sc.next();
			if (!(list.contains(s[i]))) {
				list.add(s[i]);
			}
		}
		
		if (list.size() == 3) {
			System.out.println("Three");
		} else {
			System.out.println("Four");
		}
		
	
	}
		
}