Imports System.Collections.Generic
Imports System.Console

Module Program
    Sub Main()
        Dim N As Integer = CInt(ReadLine())
        Dim dic As New Dictionary(Of String, Boolean)

        For i As Integer = 0 To N - 1
            Dim S As String = NextString()
            dic(S) = True
        Next

        WriteLine(New String() {"Three", "Four"}(B2I(dic.Count = 4)))
    End Sub

    Function B2I(ok As Boolean) As Integer
        If ok Then Return 1
        Return 0
    End Function

    Function NextString() As String
        Dim result As New List(Of Char)
        Do
            Dim tmp As Integer = Read()
            If tmp < 0 Then Exit Do
            Dim nextChar As Char = Chr(tmp)

            If Not Char.IsWhiteSpace(nextChar) Then
                result.Add(nextChar)
            ElseIf nextChar <> vbCr Then
                Exit Do
            End If
        Loop
        Return New String(result.ToArray())
    End Function

End Module
