object Solution {
    def main(args: Array[String]) {
        def solve(s: String):Int = {
          s.foldLeft((0, ""))( (acc , c) => {
             val (cnt, acstr) = acc
             if (acstr.length() >= 1 && acstr.charAt(acstr.length()-1) == c) (cnt+1, c.toString)
             else (cnt, c.toString)
           })._1
        }

       val x = scala.io.Source.stdin.getLines().drop(1).map(solve(_)).map(println(_)).toList
    }
}