from collections import deque


def main():
    N = int(input())

    graph = [[] for _ in range(N)]

    for i in range(N):
        C = list(input().split())

        for s in C:
            if s != 'H':
                s = int(s)
                graph[i].append(s - 1)

    state = ["methyl" for _ in range(N)]
    seen = [False for _ in range(N)]
    dist = [0 for _ in range(N)]

    q = deque()
    q.append(0)
    seen[0] = True

    while q:
        v = q.pop()

        for nxt in graph[v]:
            if seen[nxt]:
                continue

            seen[nxt] = True
            dist[nxt] = dist[v] + 1
            q.appendleft(nxt)

    ord = [i for i in range(N)]
    ord.sort(key=lambda x: -dist[x])

    for v in ord:
        for nxt in graph[v]:
            if dist[nxt] > dist[v]:
                state[v] = "(" + state[nxt] + ")" + state[v]

    print(state[0][:-6] + "methane")
    return 0


main()