"use strict"

const Main =(nyuuryoku)=>{
const Array=nyuuryoku.split("\n")
console.log(Array)
const N = Array[0]-0
const colorArray=Array[1].split(" ")

const isyellow=colorArray.some((ele=>{ele=="y"}))

console.log(isyellow? "Three":"Four")
}

Main(require('fs').readFileSync('/dev/stdin', 'utf8'))