from sys import setrecursionlimit
setrecursionlimit(1<<20)

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


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