Problem:
Sum of Numbers

Write a program which reads an integer and prints sum of its digits.

Input

The input consists of multiple datasets. For each dataset, an integer x is given in a line. The number of digits in x does not exceed 1000.

The input ends with a line including single zero. Your program should not process for this terminal symbol.

Output

For each dataset, print the sum of digits in x.

Sample Input

123
55
1000
0

Sample Output

6
10
1

Solution in Scala (judge verdict: Accepted)

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

object Main extends App {

  var target = "-1"
  val buff = ListBuffer.empty[String]
  while(target != "0"){
    target = StdIn.readLine()
    buff += target.foldLeft(0){ (acc, f) =>
      acc + f.toString.toInt
    }.toString
  }
  
  println(buff.dropRight(1).mkString(f"%n"))
}