from collections import deque

N = int(input())
C = []
for _ in range(N):
    C_d = list(map(str, input().split()))
    C.append(C_d)

ans = deque()


def dfs(parent, pos):
    global ans
    for e in C[pos]:
        if e != "H" and e != str(parent + 1):
            e = int(e) - 1
            ans.append("(")
            dfs(pos, e)
            for i in range(3):
                ans.pop()
            ans.append("y")
            ans.append("l")
            ans.append(")")
    for s in "methane":
        ans.append(s)
    return


dfs(-1, 0)
print("".join(ans))