import Foundation

extension String {
    func extractNumberStrings() -> String {
        let strings = (self.components(separatedBy: NSCharacterSet.decimalDigits.inverted))
        return (strings.joined())
    }
}

let str = readLine()!
var result = 0
for character in str.extractNumberStrings() {
    result += Int(String(character)) ?? 0
}
print(result)