package Yukicoder

/**
 * Created by hichikawa on 2015/11/02.
 */
fun main(args: Array<String>) {
    val str = readLine() as String
    var sum = 0 as Int
    for (ch : Char in str) {
        when (ch) {
            '1','2','3','4','5','6','7','8','9' -> sum += ch.toString().toInt()
        }
    }
    println(sum)
}