class Set(): #BinaryIndexedTree
    def __init__(self, valuelist):
        self.n = len(valuelist)
        self.value = sorted(valuelist)
        self.comp = {v : k for k, v in enumerate(self.value, 1)}
        self.bit = BinaryIndexedTree(self.n)

    def insert(self, x, k=1):
        self.bit.add(self.comp[x], k)

    def delete(self, x, k=1):
        self.bit.add(self.comp[x], -k)

    def count(self, x):
        return self.bit.get(self.comp[x])

    def get(self, k):
        return self.value[self.bit.bisect_left(k)-1]

class BinaryIndexedTree():  #1-indexed
    def __init__(self, n):
        self.n = n
        self.tree = [0 for _ in range(n + 1)]

    def sum(self, index):
        res = 0
        while index:
            res += self.tree[index]
            index -= index & -index
        return res

    def get(self, index):
        return self.sum(index) - self.sum(index - 1)

    def add(self, index, x):
        while index <= self.n:
            self.tree[index] += x
            index += index & -index

    def bisect_left(self, x):
        if x <= 0: return 0
        res, tmp = 0, 2**((self.n).bit_length() - 1)
        while tmp:
            if res + tmp <= self.n and self.tree[res + tmp] < x:
                x -= self.tree[res + tmp]
                res += tmp
            tmp >>= 1
        return res + 1

import sys
input = sys.stdin.readline

INF = 10**18 + 1

Q, K = map(int, input().split())

query = []
value = [INF]

for _ in range(Q):
    q = tuple(map(int, input().split()))
    if q[0] == 1:
        value.append(q[1])
    query.append(q)

S = Set(set(value))
S.insert(INF)

for q in query:
    if q[0] == 1:
        S.insert(q[1])
    else:
        v = S.get(K)
        if v == INF:
            print(-1)
        else:
            print(v)
            S.delete(v)