/**
 * code generated by JHelper
 * More info: https://github.com/AlexeyDmitriev/JHelper
 * @author aajisaka
 */

#include<bits/stdc++.h>

using namespace std;

void debug_out() { cerr << endl; }
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
  cerr << " " << to_string(H);
  debug_out(T...);
}
#ifdef LOCAL
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif

#define SPEED ios_base::sync_with_stdio(false);cin.tie(nullptr)
#define rep(i,n) for(int i=0; i<(int)(n); i++)
#define all(v) v.begin(), v.end()
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }

using ll = long long;
using P = pair<ll, ll>;

constexpr double PI = 3.14159265358979323846;
mt19937_64 engine(chrono::steady_clock::now().time_since_epoch().count());
// Original: https://qiita.com/drken/items/1b7e6e459c24a83bb7fd
// BEGIN
template<class VAL> struct RBST {
    VAL SUM_UNITY = 0;                              // to be set

    unsigned int randInt() {
      static unsigned int tx = 123456789, ty = 362436069, tz = 521288629, tw = 88675123;
      unsigned int tt = (tx ^ (tx << 11));
      tx = ty; ty = tz; tz = tw;
      return (tw = (tw ^ (tw >> 19)) ^ (tt ^ (tt >> 8)));
    }

    struct NODE {
        NODE *left, *right;
        VAL val;                        // the value of the node
        int size;                       // the size of the subtree
        VAL sum;                        // the value-sum of the subtree

        NODE() : val(SUM_UNITY), size(1), sum(SUM_UNITY) {
          left = right = NULL;
        }

        NODE(VAL v) : val(v), size(1), sum(v) {
          left = right = NULL;
        }

        /* additional update */
        inline void update() {

        }

        /* additional lazy-propagation */
        inline void push() {

          /* ex: reverse */
          /*
          if (this->rev) {
          swap(this->left, this->right);
          if (this->left) this->left->rev ^= true;
          if (this->right) this->right->rev ^= true;
          this->rev = false;
          }
          */
        }
    };


    ///////////////////////
    // root
    ///////////////////////

    NODE* root;
    RBST() : root(NULL) { }
    RBST(NODE* node) : root(node) { }


    ///////////////////////
    // basic operations
    ///////////////////////

    /* size */
    inline int size(NODE *node) {
      return !node ? 0 : node->size;
    }
    inline int size() {
      return this->size(this->root);
    }

    /* sum */
    inline VAL sum(NODE *node) {
      return !node ? SUM_UNITY : node->sum;
    }
    inline VAL sum() {
      return this->sum(this->root);
    }

    /* update, push */
    inline NODE* update(NODE *node) {
      node->size = size(node->left) + size(node->right) + 1;
      node->sum = sum(node->left) + sum(node->right) + node->val;
      node->update();
      return node;
    }

    inline void push(NODE *node) {
      if (!node) return;
      node->push();
    }

    /* lower_bound */
    inline int lowerBound(NODE *node, VAL val) {
      push(node);
      if (!node) return 0;
      if (val <= node->val) return lowerBound(node->left, val);
      else return size(node->left) + lowerBound(node->right, val) + 1;
    }
    inline int lowerBound(VAL val) {
      return this->lowerBound(this->root, val);
    }

    /* upper_bound */
    inline int upperBound(NODE *node, VAL val) {
      push(node);
      if (!node) return 0;
      if (val >= node->val) return size(node->left) + upperBound(node->right, val) + 1;
      else return upperBound(node->left, val);
    }
    inline int upperBound(VAL val) {
      return this->upperBound(this->root, val);
    }

    /* count */
    inline int count(VAL val) {
      return upperBound(val) - lowerBound(val);
    }

    /* get --- k: 0-index */
    inline VAL get(NODE *node, int k) {
      push(node);
      if (!node) return -1;
      if (k == size(node->left)) return node->val;
      if (k < size(node->left)) return get(node->left, k);
      else return get(node->right, k - size(node->left) - 1);
    }
    inline VAL get(int k) {
      return get(this->root, k);
    }


    ///////////////////////
    // merge-split
    ///////////////////////

    NODE* merge(NODE *left, NODE *right) {
      push(left);
      push(right);
      if (!left || !right) {
        if (left) return left;
        else return right;
      }
      if (randInt() % (left->size + right->size) < left->size) {
        left->right = merge(left->right, right);
        return update(left);
      }
      else {
        right->left = merge(left, right->left);
        return update(right);
      }
    }
    void merge(RBST add) {
      this->root = this->merge(this->root, add.root);
    }
    pair<NODE*, NODE*> split(NODE* node, int k) { // [0, k), [k, n)
      push(node);
      if (!node) return make_pair(node, node);
      if (k <= size(node->left)) {
        pair<NODE*, NODE*> sub = split(node->left, k);
        node->left = sub.second;
        return make_pair(sub.first, update(node));
      }
      else {
        pair<NODE*, NODE*> sub = split(node->right, k - size(node->left) - 1);
        node->right = sub.first;
        return make_pair(update(node), sub.second);
      }
    }
    RBST split(int k) {
      pair<NODE*, NODE*> sub = split(this->root, k);
      this->root = sub.first;
      return RBST(sub.second);
    }


    ///////////////////////
    // insert-erase
    ///////////////////////

    void insert(const VAL val) {
      pair<NODE*, NODE*> sub = this->split(this->root, this->lowerBound(val));
      this->root = this->merge(this->merge(sub.first, new NODE(val)), sub.second);
    }

    void erase(const VAL val) {
      if (!this->count(val)) return;
      pair<NODE*, NODE*> sub = this->split(this->root, this->lowerBound(val));
      this->root = this->merge(sub.first, this->split(sub.second, 1).second);
    }


    ///////////////////////
    // debug
    ///////////////////////

    void print(NODE *node) {
      if (!node) return;
      push(node);
      print(node->left);
      cout << node->val << " ";
      print(node->right);
    }
    void print() {
      cout << "{";
      print(this->root);
      cout << "}" << endl;
    }
};
// END

class D {
public:
    void solve(istream& cin, ostream& cout) {
      SPEED;
      int q, k; cin >> q >> k;
      RBST<ll> st;
      while(q--) {
        int a; cin >> a;
        if (a==1) {
          ll v; cin >> v;
          st.insert(v);
        } else {
          if (st.size() < k) {
            cout << -1 << '\n';
          } else {
            ll ret = st.get(k-1);
            //debug(ret);
            cout << ret << '\n';
            st.erase(ret);
          }
        }
      }
    }
};

signed main() {
  D solver;
  std::istream& in(std::cin);
  std::ostream& out(std::cout);
  solver.solve(in, out);
  return 0;
}