function demo(arr) {
  let array = arr;

  let equimpents = array.slice(0, 1);

  let arrOfEquipments = equimpents.toString().split(" ");

  let newArrOfCommands = array.splice(1);

  let lengthOfCommands = newArrOfCommands.length;

  let lengthOfEquipments = arrOfEquipments.length;

  for (let i = 0; i < lengthOfCommands; i++) {
    let currentElement = "";

    currentElement = newArrOfCommands.splice(0, 1).toString().split(" ");

    let command = "";

    command = currentElement[0];

    lengthOfEquipments = arrOfEquipments.length;

    if (command == "Buy") {
      let product = "";

      product = currentElement[1];

      arrOfEquipments.push(product);
    } else if (command == "Trash") {
      let productToDelete = "";

      productToDelete = currentElement[1];

      for (let j = 0; j < lengthOfEquipments; j++) {
        let weapon = "";

        weapon = arrOfEquipments[j];

        if (weapon == productToDelete) {
          arrOfEquipments.splice(j, 1);
        }
      }
    } else if (command == "Repair") {
      let weaponForRepair = "";

      weaponForRepair = currentElement[1];

      for (let k = 0; k < lengthOfEquipments; k++) {
        let weapon = "";

        weapon = arrOfEquipments[k];

        if (weapon == weaponForRepair) {
          let elementForRemove = arrOfEquipments.splice(k, 1).toString();

          arrOfEquipments.push(elementForRemove);
        }
      }
    } else if (command == "Upgrade") {
      let weapon = currentElement[1].toString();

      let currentWeapon = "";

      let upgrade = "";

      for (let y = 0; y < weapon.length - 1; y++) {
        let letter = "";

        letter = weapon[y];

        if (letter == "-") {
          for (let a = y + 1; a <= weapon.length - 1; a++) {
            let lettersForUpgrade = "";
            lettersForUpgrade = weapon[a];
            upgrade += lettersForUpgrade;
            y = a;
          }
        } else {
          currentWeapon += letter;
        }
      }

      for (let r = 0; r < lengthOfEquipments; r++) {
        let typeOfWeapon = "";
        typeOfWeapon = arrOfEquipments[r];

        if (typeOfWeapon == upgrade) {
          arrOfEquipments.splice(r + 1, 0, `${currentWeapon}:${upgrade}`);
        }
      }
    }
  }
  console.log(arrOfEquipments.join(" "));
}