import scala.collection.mutable
import scala.io.StdIn

/**
  * AOJ
  */
object Main {

  val alphabet = "abcdefghijklmnopqrstuvwxyz"

  def main(args: Array[String]): Unit = {

    var alphabetMap = mutable.Map.empty[Char,Int]
    for(c <- alphabet){
      alphabetMap +=  c -> 0
    }

    for(c <- StdIn.readLine().toLowerCase){
      if(alphabetMap.contains(c)){
        alphabetMap(c) += 1
      }
    }

    for(c <- alphabet){
      println(c + " : " + alphabetMap(c).toString)
    }
  }
}