val list = mutableListOf("Apple", "Banana", "Orange", "Pear", "Grape")
list.add("Watermelon")
val map = HashMap<String, Int>()
map["Apple"] = 1
val number = map["Apple"]
val map = mapOf("Apple" to 1, "Banana" to 2, "Orange" to 3, "Pear" to 4, "Grape" to 5)
for ((fruit, number) in map) {
   println("fruit is " + fruit + ", number is " + number)
}