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 inputString = readLine()!!
        if (inputString == "0") break
        println("${inputString.map { it.toString().toInt() }.sum()}")
    }
}