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fun main() {

    println("test@mail.ru".isValidEmail())

    println("testmail.ru".isValidEmail())

    println("secret123".maskPassword())

    println("ab".maskPassword())

    println("Привет как дела".wordCount())

    println("Я учу Kotlin".wordCount())

    println(10.isEven())

    println(7.isEven())

    println(2.hoursToMinutes())

    println(5.hoursToMinutes())

    3 timesRepeat {

        println("Привет!")

    }

    val numbers = listOf(10, 20, 30)

    println(numbers.secondOrNull())

    println(numbers.thirdOrNull())

    val smallList = listOf(10)

    println(smallList.secondOrNull())

    println(smallList.thirdOrNull())

}