swap_two_and_two.scala

object Solution {
    
    def main(args: Array[String]) {
        val testCases = readInt
        for(i <- 1 to testCases) {
            val string = readLine
            println(string.grouped(2)
                    .map(l => List(l(1), l(0)))
                    .flatten
                    .mkString(""))
        }
    }
}