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 Kotlin (judge verdict: Accepted)

fun main(args: Array<String>) {
    while (true) {
        val x = readLine()!!
        val digits = x.length
        if (x == "0") break

        var sum = 0
        for (i in 0 until digits) {
            val number: Int = x.substring(i, i + 1).toInt()
            sum += number
        }
        println(sum)

    }
}