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 LuaJIT (2.0.4) (judge verdict: Accepted)

local function split(text, delimiter)
   if text.find(text, delimiter) == nil then
     return { text }
   end

   local splited_texts = {}
   local last_position

   for splited_text, position in text:gmatch("(.-)"..delimiter.."()") do
     table.insert(splited_texts, splited_text)
     last_position = position
   end
   table.insert(splited_texts, string.sub(text, last_position))
   return splited_texts
end

local total = io.read()
local arares = io.read()

local color = {}
color["p"] = 0
color["w"] = 0
color["g"] = 0
color["y"] = 0

local arare_list = split(arares, " ")
for k,v in pairs(arare_list) do
  if v == "P" then
    color["p"] = color["p"] + 1
  elseif v == "W" then
    color["w"] = color["w"] + 1
  elseif v == "G" then
    color["g"] = color["g"] + 1
  elseif v == "Y" then
    color["y"] = color["y"] + 1
  end
end

local number = 0
if color["p"] > 0 then
 number = number + 1
end
if color["w"] > 0 then
 number = number + 1
end
if color["g"] > 0 then
 number = number + 1
end
if color["y"] > 0 then
 number = number + 1
end

if number == 3 then
  print("Three")
elseif number == 4 then
  print("Four")
end