import kotlin.test.*

fun main(args: Array<String>) {
//sampleStart
val list = listOf("aa", "b", "bb", "a")

val lengthThenNatural = compareBy<String> { it.length }
    .then(naturalOrder())

val sorted = list.sortedWith(lengthThenNatural)

println(sorted) // [a, b, aa, bb]
//sampleEnd
}