package main

import . "fmt"
import . "os"
import bf "bufio"

func main() {
	rd:=bf.NewReader(Stdin)
	var n int
	Fscan(rd,&n)
	g:=make([][]int,n+1)
	for i:=range g[1:] {
		for j:=0;j<4;j++ {
			var s string
			var e int
			Fscan(rd,&s)
			if s=="H" {
				continue
			}
			Sscan(s,&e)
			g[i+1]=append(g[i+1],e)
		}
	}
	v:=make([]bool,n+1)
	var dfs func(x int)
	dfs=func(x int) {
		if v[x] {
			return
		}
		v[x]=true
		Print("(")
		for _,e:=range g[x] {
			dfs(e)
		}
		Print("methyl)")
	}
	v[1]=true
	for _,e:=range g[1] {
		dfs(e)
	}
	Println("methane")
}