class Addnumbers
    attr_reader :s

    def initialize(s: "")
        @s = s
    end

    def datainput
        begin
            @s = gets.chomp
        rescue
            
        end
    end

    def total_numbers(str)
        str = str.split("")
        str.each_with_index do |c, i|
            str[i] = (c =~ /[0-9]/)? c.to_i : 0
        end
        str.inject(:+)
    end

    def dataoutput
        puts total_numbers(@s)
    end

    def run
        datainput
        dataoutput
    end
end

if $0 == __FILE__
    Addnumbers.new.run
end