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
      chars.filter(c => 'a' <= c && c <= 'z').foreach(c => arr(c - 'a') += 1)
    }
    'a' to 'z' foreach(c => println(c + " : " + arr(c - 'a')))
  }
}