## https://yukicoder.me/problems/no/649


class BinaryIndexTree:
    """
    フェニック木(BinaryIndexTree)の基本的な機能を実装したクラス
    """
    def __init__(self, size):
        self.size = size
        self.array = [0] * (size + 1)
    
    def add(self, x, a):
        index = x
        while index <= self.size:
            self.array[index] += a
            index += index & (-index)
    
    def sum(self, x):
        index = x
        ans = 0
        while index > 0:
            ans += self.array[index]
            index -= index & (-index)
        return ans

    def least_upper_bound(self, value):
        if self.sum(self.size) < value:
            return -1
        elif value <= 0:
            return 0

        m = 1
        while m < self.size:
            m *= 2

        k = 0
        k_sum = 0
        while m > 0:
            k0 = k + m
            if k0 < self.size:
                if k_sum + self.array[k0] < value:
                    k_sum += self.array[k0]
                    k += m
            m //= 2
        if k < self.size:
            return k + 1
        else:
            return -1


def main():
    Q, K = map(int, input().split())
    queries = []
    for _ in range(Q):
        values = tuple(map(int, input().split()))
        queries.append(values)

    # 座標圧縮
    v_set = set()
    for values in queries:
        if values[0] == 1:
            v_set.add(values[1])
    v_list = list(v_set)
    v_list.sort()
    v_map = {}
    for i, v in enumerate(v_list):
        v_map[v] = i + 1
    v_max = len(v_list) 

    bit = BinaryIndexTree(v_max)   
    for values in queries:
        if values[0] == 1:
            _, v = values
            bit.add(v_map[v], 1)
        else:
            if bit.sum(bit.size) < K:
                print(-1)
            else:
                v = bit.least_upper_bound(K)
                print(v_list[v - 1])
                bit.add(v, - 1)





if __name__ == "__main__":
    main()