hackerank The Love-Letter Mystery in Scala

The Love-Letter Mystery.scala

import scala.collection.immutable.StringOps;

object Solution {
  def main(args: Array[String]) {
    val lines = io.Source.stdin.getLines().toList
    for(line <- lines.drop(1))
	  {
	    val l = line; 
	    var (first, tmpSecond) = l.splitAt(l.size /2 )
      val second = if(first.length() != tmpSecond.length()) tmpSecond.drop(1).reverse 
                    else  tmpSecond.reverse
      var charPairs =  first.zip(second)
	    var changes = charPairs.foldLeft(0) ( (a, b) => a + math.abs( b._1.toInt - b._2.toInt))
      println(changes)
 
	  }
  }
}