import java.util.*;

public class Main {
  static int N;
  static int[] dat;

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int q = sc.nextInt();
    int k = sc.nextInt();
    HashSet<Long> set = new HashSet<Long>();
    ArrayList<Long> list = new ArrayList<Long>();
    long[][] que = new long[q][2];
    for(int i = 0; i < q; i++) {
      int s1 = sc.nextInt();
      if(s1 == 1) {
        long s2 = sc.nextLong();
        que[i][0] = 1;
        que[i][1] = s2;
        set.add(s2);
      } else {
        que[i][0] = 2;
      }
    }
    for(Iterator<Long> i = set.iterator(); i.hasNext();) {
      list.add(i.next());
    }
    Collections.sort(list);
    long[] ret = new long[list.size()];
    HashMap<Long, Integer> map = new HashMap<Long, Integer>();
    for(int i = 0; i < list.size(); i++) {
      long r = list.get(i);
      map.put(r, i);
      ret[i] = r;
    }
    init(list.size());
    for(int i = 0; i < q; i++) {
      if(que[i][0] == 1) {
        update(map.get(que[i][1]), 1);
      } else {
        int l = 0;
        int r = list.size();
        int ans = 0;
        if(query(0, N, 0, 0, N) >= k) {
        while(l < r) {
          int med = (l + r) / 2;
          int sum = query(0, med + 1, 0, 0, N);
          if(sum == k) {
            ans = med;
            r = med;
          } else if(sum > k) {
            ans = med;
            r = med;
          } else {
            l = med + 1;
          }
        }
        update(ans, -1);
        System.out.println(ret[ans]);
        } else {
          System.out.println(-1);
        }
      }
    }
  }

  public static void init(int n_) {
    int n = 1;
    while(n < n_) {
      n *= 2;
    }
    N = n;
    dat = new int[2 * N - 1];
  }

  public static void update(int k, int x) {
    int a = k + N - 1;
    dat[a] += x;
    while(a > 0) {
      a = (a - 1) / 2;
      dat[a] = dat[2 * a + 1] + dat[2 * a + 2]; 
    }
  }

  public static int query(int a, int b, int k, int l, int r) {
    if((r <= a) || (l >= b)) return 0;
    if((a <= l) && (r <= b)) {
      return dat[k];
    } else {
      int vl = query(a, b, 2 * k + 1, l, (l + r) / 2);
      int vr = query(a, b, 2 * k + 2, (l + r) / 2, r);
      return vl + vr;
    }
  }
}