n, k = map(int, input().split())

m = 10 ** 5

items = [[] for _ in range(m)]
for i in range(n):
  si, pi, ui = map(int, input().split())
  ui -= 1
  items[ui].append((si, pi, i))

teams = []
for ui in range(m):
  items[ui].sort(key=lambda x: (- x[0], x[2]))
  for j in range(len(items[ui])):
    si, pi, i = items[ui][j]
    teams.append((- si, j, pi, i))

teams.sort()
print(*[i for _, _, _, i in teams[:k]], sep="\n")