N, K = map(int, input().split())
SPU = [tuple(map(int, input().split()))+(i,) for i in range(N)]
SPU.sort(key=lambda k: (-k[0], k[1]))
cnt = [0]*(N+1)
SPU_ = []

for Si, Pi, Ui, i in SPU:
    SPU_.append((Si, cnt[Ui], Pi, i))
    cnt[Ui] += 1

SPU_.sort(key=lambda k: (-k[0], k[1], k[2]))

for _, _, _, i in SPU_[:K]:
    print(i)