import java.io.*; import java.util.*; public class Main_yukicoder433 { private static Scanner sc; private static Printer pr; private static void solve() { univ = new int[100_000 + 1]; List> univs = new ArrayList<>(100_000 + 1); for (int i = 0; i < 100_000 + 1; i++) { univs.add(new HashSet<>()); } int n = sc.nextInt(); int k = sc.nextInt(); PriorityQueue pq = new PriorityQueue<>(); for (int i = 0; i < n; i++) { int s = sc.nextInt(); int p = sc.nextInt(); int u = sc.nextInt(); pq.add(new Team(i, s, p, u)); univs.get(u).add(i); } Set update = new HashSet<>(); while (n - pq.size() < k) { Team e = pq.remove(); if (update.contains(e.no)) { update.remove(e.no); pq.add(e); } else { pr.println(e.no); pr.flush(); univ[e.u]++; univs.get(e.u).remove(e.no); update.addAll(univs.get(e.u)); } } } private static int[] univ; private static class Team implements Comparable { int no; int s; int p; int u; Team(int no, int s, int p, int u) { this.no = no; this.s = s; this.p = p; this.u = u; } @Override public int compareTo(Team o) { if (s != o.s) { return -Integer.compare(s, o.s); } if (univ[u] != univ[o.u]) { return Integer.compare(univ[u], univ[o.u]); } return Integer.compare(p, o.p); } } // --------------------------------------------------- public static void main(String[] args) { sc = new Scanner(System.in); pr = new Printer(System.out); solve(); pr.close(); sc.close(); } @SuppressWarnings("unused") private static class Scanner { BufferedReader br; Scanner (InputStream in) { br = new BufferedReader(new InputStreamReader(in)); } private boolean isPrintable(int ch) { return ch >= '!' && ch <= '~'; } private boolean isCRLF(int ch) { return ch == '\n' || ch == '\r' || ch == -1; } private int nextPrintable() { try { int ch; while (!isPrintable(ch = br.read())) { if (ch == -1) { throw new NoSuchElementException(); } } return ch; } catch (IOException e) { throw new NoSuchElementException(); } } String next() { try { int ch = nextPrintable(); StringBuilder sb = new StringBuilder(); do { sb.appendCodePoint(ch); } while (isPrintable(ch = br.read())); return sb.toString(); } catch (IOException e) { throw new NoSuchElementException(); } } int nextInt() { try { // parseInt from Integer.parseInt() boolean negative = false; int res = 0; int limit = -Integer.MAX_VALUE; int radix = 10; int fc = nextPrintable(); if (fc < '0') { if (fc == '-') { negative = true; limit = Integer.MIN_VALUE; } else if (fc != '+') { throw new NumberFormatException(); } fc = br.read(); } int multmin = limit / radix; int ch = fc; do { int digit = ch - '0'; if (digit < 0 || digit >= radix) { throw new NumberFormatException(); } if (res < multmin) { throw new NumberFormatException(); } res *= radix; if (res < limit + digit) { throw new NumberFormatException(); } res -= digit; } while (isPrintable(ch = br.read())); return negative ? res : -res; } catch (IOException e) { throw new NoSuchElementException(); } } long nextLong() { try { // parseLong from Long.parseLong() boolean negative = false; long res = 0; long limit = -Long.MAX_VALUE; int radix = 10; int fc = nextPrintable(); if (fc < '0') { if (fc == '-') { negative = true; limit = Long.MIN_VALUE; } else if (fc != '+') { throw new NumberFormatException(); } fc = br.read(); } long multmin = limit / radix; int ch = fc; do { int digit = ch - '0'; if (digit < 0 || digit >= radix) { throw new NumberFormatException(); } if (res < multmin) { throw new NumberFormatException(); } res *= radix; if (res < limit + digit) { throw new NumberFormatException(); } res -= digit; } while (isPrintable(ch = br.read())); return negative ? res : -res; } catch (IOException e) { throw new NoSuchElementException(); } } float nextFloat() { return Float.parseFloat(next()); } double nextDouble() { return Double.parseDouble(next()); } String nextLine() { try { int ch; while (isCRLF(ch = br.read())) { if (ch == -1) { throw new NoSuchElementException(); } } StringBuilder sb = new StringBuilder(); do { sb.appendCodePoint(ch); } while (!isCRLF(ch = br.read())); return sb.toString(); } catch (IOException e) { throw new NoSuchElementException(); } } void close() { try { br.close(); } catch (IOException e) { // throw new NoSuchElementException(); } } } private static class Printer extends PrintWriter { Printer(PrintStream out) { super(out); } } }