Bussing

#include <iostream>
#include <cmath>
using namespace std;
class Car {
protected:
  int pos;
public:
  Car() {
    this->pos = 0;
  }
  void move(int direction) {
    this->pos += direction;
  }
  int get_position() {
    return this->pos;
  }
};

class Bus: public Car {
  int capacity;
  int psg_count;
  int *passengers;
public:
  Bus(int capacity) {
    this->capacity = capacity;
    psg_count = 0;
    passengers = new int[capacity];
  }
  ~Bus() {
    delete[] passengers;
  }
  bool add_passenger(int destination) {
    if (capacity == psg_count) {
      return false;
    } else {
      this->passengers[psg_count] = destination;
      psg_count++;
      return true;
    }
  }
  void release() {
    for (int i = 0; i < this->capacity; i++) {
      if (this->pos == passengers[i]) {
        psg_count--;
        passengers[i] = 0;
      }
    }
  }
  int get_passenger_count() {
    return psg_count;
  }
};
int main() {
  string cmd;
  int cmd_count, capacity, temp;
  cin >> cmd_count >> capacity;
  Bus bussing(capacity);
  for (int i = 0; i < cmd_count; i++) {
    cin >> cmd;
    if (cmd == "MOVE") {
      cin >> temp;
      bussing.move(temp);
    } else if (cmd == "POSITION") {
      cout << bussing.get_position() << endl;
    } else if (cmd == "PASSENGER") {
      cin >> temp;
      if (bussing.add_passenger(temp)) {
        cout << "SUCCESS" << endl;
      } else {
        cout << ":(" << endl;
      }
    } else if (cmd == "RELEASE") {
      bussing.release();
    } else {
      cout << bussing.get_passenger_count() << endl;
    }
  }
  return 0;
}