N, K = tuple(int(i) for i in input().split())
team_lst = []
school_dic = {}

for i in range(N):
    sn, pn, un = tuple(int(i) for i in input().split())
    team_lst += [(sn, -pn, un, i)]

team_lst = sorted(team_lst, reverse=True)

team_lst2 = []
for r in team_lst:
    sn, pn, un, idx = r
    sum_un = school_dic.get(un, 0) + 1
    school_dic[un] = sum_un
    team_lst2 += [(sn, -sum_un, pn, idx)]

team_lst2 = sorted(team_lst2, reverse=True)

for r in team_lst2[:K]:
    _, _, _, idx = r
    print(r[3])