function plantDiscovery(input) {
  let countPlants = Number(input.shift());

  let plants = {};
  let originalRarity = {};
  let rating = {};

  for (let i = 0; i < countPlants; i++) {

    let rowOfPlantInfo = input.shift();
    let [plant, rarity] = rowOfPlantInfo.split("<->");

    plants[plant] = Number(rarity);
    originalRarity[plant] = Number(rarity);
    rating[plant] = 0;

  }

  for (let row of input) {
    let [command, elements] = row.split(": ");

    if (command === "Exhibition") {

      console.log(`Plants for the exhibition:`);
      break;
    }

    if (command === "Rate") {

      let [plant, newRating] = elements.split(" - ");

      if (plants.hasOwnProperty(plant)) {

        rating[plant] += Number(newRating);
      }
      else {
        console.log("error");
      }
    }
    else if (command === "Update") {

      let [plant, newRarity] = elements.split(" - ");

      if (plants.hasOwnProperty(plant)) {

        plants[plant] = Number(newRarity);
      }
      else {
        console.log("error");
      }
    }
    else if (command === "Reset") {

        if (plants.hasOwnProperty(elements)) {
        plants[elements] = originalRarity[elements];
      }
      else {
        console.log("error");
      }
    }
  }

  let array = Object.entries(plants);
  let ratingArr = Object.entries(rating);

  for (let [plant, rarity] of array) {
    avg = 0;

    for (let [plant1, rating] of ratingArr) {

      if (plant === plant1) {

        avg = rating.toFixed(2);
        break;
      }
    }

    console.log(`- ${plant}; Rarity: ${rarity} Rating: ${avg}`);
  }
}

plantDiscovery([
  "3",
  "Arnoldii<->4",
  "Woodii<->7",
  "Welwitschia<->2",
  "Rate: Woodii - 10",
  "Rate: Welwitschia - 7",
  "Rate: Arnoldii - 3",
  "Rate: Woodii - 5",
  "Update: Woodii - 5",
  "Reset: Arnoldii",
  "Exhibition",
]);