#include <bits/stdc++.h>
using namespace std;

typedef long long   signed int LL;
typedef long long unsigned int LU;

#define incID(i, l, r) for(int i = (l)    ; i <  (r); i++)
#define incII(i, l, r) for(int i = (l)    ; i <= (r); i++)
#define decID(i, l, r) for(int i = (r) - 1; i >= (l); i--)
#define decII(i, l, r) for(int i = (r)    ; i >= (l); i--)
#define  inc(i, n) incID(i, 0, n)
#define inc1(i, n) incII(i, 1, n)
#define  dec(i, n) decID(i, 0, n)
#define dec1(i, n) decII(i, 1, n)

#define inII(v, l, r) ((l) <= (v) && (v) <= (r))
#define inID(v, l, r) ((l) <= (v) && (v) <  (r))

#define PB push_back
#define EB emplace_back
#define MP make_pair
#define FI first
#define SE second
#define PQ priority_queue

#define  ALL(v)  v.begin(),  v.end()
#define RALL(v) v.rbegin(), v.rend()
#define  FOR(it, v) for(auto it =  v.begin(); it !=  v.end(); ++it)
#define RFOR(it, v) for(auto it = v.rbegin(); it != v.rend(); ++it)

template<typename T> bool   setmin(T & a, T b) { if(b <  a) { a = b; return true; } else { return false; } }
template<typename T> bool   setmax(T & a, T b) { if(b >  a) { a = b; return true; } else { return false; } }
template<typename T> bool setmineq(T & a, T b) { if(b <= a) { a = b; return true; } else { return false; } }
template<typename T> bool setmaxeq(T & a, T b) { if(b >= a) { a = b; return true; } else { return false; } }
template<typename T> T gcd(T a, T b) { return (b == 0 ? a : gcd(b, a % b)); }
template<typename T> T lcm(T a, T b) { return a / gcd(a, b) * b; }

// ---- ----

template<typename T> class SegTree {
private:
	T * a = NULL;
	int N = -1, S;
	function<T(T, T)> F;
	T I;
	bool is_available = false;

public:
	SegTree() { }
	SegTree(int n, function<T(T, T)> func, T id) { init(n, func, id); }
	
	// [0, n) が使用可能になる、func が演算、id は単位元
	void init(int size, function<T(T, T)> func, T id) {
		assert(size > 0);
		N = size;
		F = func;
		I = id;
		S = 1;
		while(S < size) { S *= 2; }
		delete[] a;
		a = new T[S * 2];
		inc(i, S * 2) { a[i] = I; }
		is_available = true;
	}
	
	// [p] の値を返す
	T operator[](int p) {
		assert(inID(p, 0, N));
		p += S;
		return a[p];
	}
	
	// [p] への参照を返す（calc() を呼ぶまで fold は使用不能になる）
	T & ref(int p) {
		is_available = false;
		assert(inID(p, 0, N));
		p += S;
		return a[p];
	}
	
	// テーブル全体を再計算
	void calc() {
		decID(i, 1, S) { a[i] = F(a[i * 2], a[i * 2 + 1]); }
		is_available = true;
	}
	
	// [p] に op を適用しテーブルを更新
	void apply(int p, function<void(T &)> op) {
		assert(inID(p, 0, N));
		p += S;
		op(a[p]);
		while(p != 1) {
			p /= 2;
			a[p] = F(a[p * 2], a[p * 2 + 1]);
		}
	}
	
	// [l, r) に f を適用した結果を返す
	T fold_ID(int l, int r, bool loop = false) {
		assert(is_available);
		assert(inII(l, 0, N));
		assert(inII(r, 0, N));
		if(loop && l >= r) { return F(fold_ID(l, N), fold_ID(0, r)); }
		assert(l <= r);
		l += S;
		r += S;
		
		T v = I, w = I;
		while(l < r) {
			if(l + 1 == r) { v = F(v, a[l]); break; }
			
			if(l % 2 == 1) { v = F(v, a[l]); }
			if(r % 2 == 1) { w = F(a[r - 1], w); }
			
			l = (l + 1) / 2;
			r = r / 2;
		}
		
		return F(v, w);
	}
	
	T fold_II(int l, int r, bool loop = false) { return fold_ID(l, r + 1, loop); }
};

#define OP(op) [](auto a, auto b) { return op; }
#define AP(op) [](auto & a) { op; }

// ---- ---- ---- ----

#define UQns(v) v.erase(unique(ALL(v)), v.end())
#define UQ(v) sort(ALL(v)); UQns(v)

LL q, k, t[200000], v[200000];
vector<LL> rv;
map<LL, int> vr;

int main() {
	cin >> q >> k;
	
	inc(i, q) {
		cin >> t[i];
		if(t[i] == 1) { cin >> v[i]; rv.PB(v[i]); }
	}
	UQ(rv);
	inc(i, rv.size()) { vr[rv[i]] = i; }
	
	int s = rv.size() + 1;
	SegTree<int> st(s, OP(a + b), 0);
	int c = 0;
	inc(i, q) {
		if(t[i] == 1) {
			c++;
			st.apply(vr[v[i]], AP(a++));
		} else {
			if(c < k) { cout << "-1\n"; } else {
				int L = 0, H = s;
				while(H - L > 1) {
					int M = (L + H) / 2;
					(st.fold_ID(0, M) < k ? L : H) = M;
				}
				
				cout << rv[L] << "\n";
				st.apply(L, AP(a--));
				c--;
			}
		}
	}
	
	return 0;
}