import System.*
import System.Console.*
import System.Collections.*
import System.Linq.*

func Read(values: Sequence<int>) {
    WriteLine(values.Count)
    WriteLine(values[0])
    WriteLine(values.ToList().Count)
}

func Replace(values: MutableSequence<int>, value: int) {
    values[0] = value
}

func Append(values: List<int>) {
    values.Add(11)
}

func Main() {
    let array: Array<int> = [1, 2]
    let list = ArrayList<int>()
    list.Add(3)
    list.Add(4)

    Replace(array, 42)
    Replace(list, 7)
    Read(array)
    Read(list)

    let view: Sequence<int> = array
    array[0] = 9
    WriteLine(view[0])
    WriteLine(array.Count)
    Append(list)
    WriteLine(list.Count)
    WriteLine(list[2])
}