N = int(input())
g = [[] for _ in range(N)]
for i in range(N):
	C = input().split()
	for j in C:
		if j != 'H':
			g[i].append(int(j) - 1)

vis = [False] * N

ans = ""

def dfs(u):
	vis[u] = True
	global ans
	ans += '('
	for v in g[u]:
		if not vis[v]:
			dfs(v)
	ans += 'methyl)'

dfs(0)

print(ans[1:-7] + "methane")