import sys
r = sys.stdin
Q,K = map(int,r.readline().split())

l = []
s = set()
for _ in range(Q):
    a = list(map(int,r.readline().split()))
    if a[0] == 1:
        l.append(a[1])
        s.add(a[1])
    else:
        l.append(-2)
D = {v:i+1 for i,v in enumerate(sorted(s))}
rD = {i+1:v for i,v in enumerate(sorted(s))}

n = len(D)
bit = [0] * (n +1)
def add(i,x):
    while i <= n:
        bit[i] += x
        i += i &-i
def lb(w):
    if w <= 0:return 0
    k = 1
    while k < n:
        k <<= 1
    k >>= 1
    x = 0
    while k > 0:
        if x + k <= n and bit[x+k] < w:
            w -= bit[x+k]
            x += k
        k >>= 1
    return x + 1

for v in l:
    if v != -2:
        add(D[v],1)
    else:
        x = lb(K)
        if x == n + 1:
            print(-1)
        else:
            print(rD[x])
            add(x,-1)