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.*;
import java.lang.*;
import java.io.*;

public class Main {
    public static void main(String args[]) {
        Scanner scan = new Scanner(System.in);
        
        int[] arr = new int[4];
        int n = scan.nextInt();
        
        while(n-- > 0){
            String temp = scan.next();
            switch(temp){
                case "G":
                    arr[0]++;
                    break;
                
                case "W":
                    arr[1]++;
                    break;
                    
                case "Y":
                    arr[2]++;
                    break;
                    
                case "P":
                    arr[3]++;
                    break;
            }
        }
        
        int ans = 0;
        for(int i : arr)
            if(i > 0) ans++;
            
        switch(ans){
            case 1:
                System.out.println("One");
                break;
                
            case 2:
                System.out.println("Two");
                break;
                
            case 3:
                System.out.println("Three");
                break;
                
            case 4:
                System.out.println("Four");
                break;
        }
        
    }
}