import java.io.*;
import java.util.*;
import java.util.stream.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int k = sc.nextInt();
        ArrayList<Long> list = new ArrayList<>();
        list.add(Long.MIN_VALUE);
        list.add(Long.MAX_VALUE);
        StringBuilder sb = new StringBuilder();
        while (n-- > 0) {
            if (sc.nextInt() == 1) {
                long x = sc.nextLong();
                int left = 0;
                int right = list.size();
                while (right - left > 1) {
                    int m = (left + right) / 2;
                    if (list.get(m) < x) {
                        left = m;
                    } else {
                        right = m;
                    }
                }
                list.add(right, x);
            } else {
                if (list.size() < k + 2) {
                    sb.append("-1\n");
                } else {
                    sb.append(list.get(k)).append("\n");
                    list.remove(k);
                }
            }
        }
        System.out.print(sb);
    }
}
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}