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 Scala (2.11.7) (judge verdict: Accepted)

import scala.io._

object Main {
	def main(args: Array[String]) {
		val input = Source.fromInputStream(System.in)
		val lines = input.getLines.toSeq

		var kindArare = List("P", "Y", "W", "G")
		var arares = lines(1).split(" ")
		var count = 0
		arares.foreach{
			s =>
			kindArare = kindArare.map{
				t =>
				if(s == t) {
					count += 1
					""
				}else{t}
			}
		}
		if (count > 3){
			println("Four")
		}else{
			  println("Three")
		}
	}
}