import sys
sys.setrecursionlimit(200010)


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)

    ans = []
    seen = [False for _ in range(N)]

    def dfs(v, ans):
        seen[v] = True

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

            ans.append("(")
            dfs(nxt, ans)
            ans.append("methyl)")

    dfs(0, ans)
    print(*ans, 'methane', sep='')
    return 0


main()