object Main{
  def main(args:Array[String]) = {
    val sc = new java.util.Scanner(System.in)
    val arr = List.fill(26)(0).toArray
    while (sc.hasNext){
      val chars = sc.next.toLowerCase.toCharArray
      for (c <- chars){
        if (97 <= c && c <= 122){
          arr(c - 97) += 1
        }
      }
    }
    for (i <- 97 to 122){
      println(i.toChar + " : " + arr(i - 97))
    }
  }
}