from sys import setrecursionlimit
setrecursionlimit(1<<20)

def dfs(G, v, visited, alkane):
    visited[v] = True
    for u in G[v]:
        if not visited[u]:
            dfs(G, u, visited, alkane)
            alkane[v] = f"({alkane[u][:-3]}yl){alkane[v]}"
            alkane[u] = ""


N = int(input())
C = [[int(c)-1 for c in input().split() if c.isdigit()] for i in range(N)]
A = ["methane" for i in range(N)]
P = [-1 for i in range(N)]
dfs(C, 0, [False for i in range(N)], A)
print(A[0])