//
// program to check whether line of text is a palindrome
//
def isPalindrome(s : String) : Boolean = {
  //version from class:
  //val lettersOnly = s.toCharArray.filter(_.isLetter).mkString
  //simpler version:
  val lettersOnly = s.filter(_.isLetter)
  lettersOnly.toLowerCase == lettersOnly.reverse.toLowerCase
}

println("enter a line of text:")
val line = readLine
println("input:")
println(line)

if (isPalindrome(line))
  println("a palindrome!")
else
  println("not a palindrome")