func main()
	var s: []char :: cui@input()
	var ans: int :: 0
	for i(0, ^s - 1)
		if(s[i] = '0')
			do ans :+ 10
		else
			do ans :+ s[i] $ int - '0' $ int
		end if
	end for
	do cui@print("\{ans}\n")
end func