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.io.StdIn._

object Main {
  def main(args: Array[String]): Unit = {
    def lines: Unit ={
      def loop(line: String): Unit ={
        if (line != "0") {
          println(line.split("").map(_.toInt).sum)
          loop(readLine())
        }
      }
      loop(readLine())
    }

    lines
  }
}