#yuki_433

n,k=map(int,raw_input().split())
s=[[0 for i in xrange(5)] for j in xrange(n)]
for i in xrange(n):
 s[i][0],s[i][1],s[i][2]=map(int,raw_input().split())
 s[i][3]=0
 s[i][4]=i
#print s
t=sorted(s,key=lambda x:(x[0],-x[1]),reverse=True)
u_cnt={}
for i in xrange(n):
 u_cnt[t[i][2]]=0
#print u_cnt
for i in xrange(n):
 u_cnt[t[i][2]]+=1
 t[i][3]=u_cnt[t[i][2]]
#print t
u=sorted(t,key=lambda x:(x[0],-x[3],-x[1]),reverse=True)
#print u
res=u[:k]
for i in xrange(len(res)):
 print res[i][4]