def passwordValid(): Boolean = {
    println("Write your password: ")
    val input = scala.io.StdIn.readLine()

    val alphabetLower = ('a' to 'z').toList
    println(alphabetLower)
    val alphabetUpper = ('A' to 'Z').toList
    val numbers = ('0' to '9').toList
    val symbols = List('$', '#', '@')
    val mergedList = alphabetLower:::alphabetUpper:::numbers:::symbols
    println(mergedList)

    var lowerCount = 0
    var upperCount = 0
    var numberCount = 0
    var characterCount = 0
    val minLength = 6
    val maxLength = 16

    var condition = true

    if (minLength <= input.length() && input.length() <= maxLength) {
      for (i <- input.toCharArray) {
        if (!mergedList.contains(i.toChar)) {
          println(i)
          condition = false
        } else {
          if (alphabetLower.contains(i)) {
            lowerCount += 1
          }
          if (alphabetUpper.contains(i)) {
            upperCount += 1
          }
          if (numbers.contains(i)) {
            numberCount += 1
          }
          if (symbols.contains(i)) {
            characterCount += 1
          }
        }
      }
    }
    if (!(lowerCount > 0 && upperCount > 0 && numberCount > 0 && characterCount > 0 )) {
      condition = false
    }
    println(condition)
    condition
  }


  def numberToAverage(number: Int): Unit = {
    if (number > 1) {
      println(s"Average is ${number/2} and the number is $number")
    } else {
      println("Please use a number greater than 1 next time")
    }
  }


  def printEven(limit: Int): Unit = {
    for (i <- 0 to limit)
      if (i % 2 == 0) {
        println(i)
      }
  }

  def getNextDay():Unit = {
    val yearList = Map(1 -> 31, 2 -> 28, 3 -> 31, 4 -> 30, 5 -> 31, 6 -> 30, 7 -> 31, 8 -> 31, 9 -> 30, 10 -> 31, 11 -> 30, 12 -> 31)

    println("Enter a year:")
    val year = scala.io.StdIn.readLine()

    println("Enter a month:")
    val month = scala.io.StdIn.readLine()

    println("Enter a day:")
    val day = scala.io.StdIn.readLine()

    try {
      var yearInt = year.toInt
      var monthInt = month.toInt
      var dayInt = day.toInt

      if (yearList.contains(monthInt)) {
        // if we are on the last day of the month cycle to next month and begin day 1
        if (dayInt == yearList(monthInt)) {
          // if we are on the last day of december increase the year and go to Jan 1st
          if (monthInt == 12) {
            yearInt += 1
            monthInt = 1
            dayInt = 1
          }
          else {
            monthInt += 1
            dayInt = 1
          }
        } else {
          dayInt += 1
        }
        println(s"Year: $yearInt, Month: $monthInt, Day: $dayInt")
      } else {
        println("Your month number is invalid. Please chose a number from 1-12")
      }

    } catch {
      case e: NumberFormatException => None
        println("Please enter only numbers next time")
    }

  }


  def uniqueValueFinder(dict: Map[Int, Int]): Int = {
    dict.values.toSet.toList.length
  }