class BIT: #0-indexed
    __slots__ = ["size", "tree","depth","n0"]
    def __init__(self, n):
        self.size = n
        self.tree = [0]*(n+1)
        self.depth = n.bit_length()
        self.n0 = 1<<self.depth

    def get_sum(self, i): #a_0 + ... + a_{i} #閉区間
        s = 0; i += 1
        while i > 0:
            s += self.tree[i]
            i -= i & -i
        return s

    def range_sum(self,l,r): #a_l + ... + a_r 閉区間
        return self.get_sum(r) - self.get_sum(l-1) 

    def range_sum_larger(self,l): #a_l + ... (端まで)
        return self.get_sum(self.size-1) - (self.get_sum(l-1) if l else 0)
    
    def add(self, i, x):
        i += 1
        while i <= self.size:
            self.tree[i] += x
            i += i & -i

    def bisect_left(self,w):
        #和が w 以上になる最小の index
        #w が存在しない場合 self.size を返す
        if w <= 0: return 0
        x,k = 0,self.n0
        for _ in range(self.depth):
            k >>= 1
            if x+k <= self.size and self.tree[x+k] < w:
                w -= self.tree[x+k]
                x += k
        return x


Q,K = map(int,input().split())
query = [list(map(int,input().split())) for _ in range(Q)]
nums = set()
for a in query:
    if a[0]==1:
        nums.add(a[1])

bit = BIT(len(nums))
zaatu = {ai:i for i, ai in enumerate(sorted(nums))}
nums = sorted(nums)
c = 0
for a in query:
    if a[0]==1:
        bit.add(zaatu[a[1]],1)
        c += 1
    else:
        if c < K:
            print(-1)
        else:
            idx = bit.bisect_left(K)
            print(nums[idx])
            bit.add(idx,-1)
            c -= 1