Sum of Digits.

[ggauny@live.fr]

Hi,
After seeying post #20 link in french, I am as before.
I think it is very simple solution but only for you.
Of course you have the solution of this challenge.
Me I will try again, with eyes I see how to do, but difficult to make the wp34s
see with eyes.

15 : 1 5 I add and it is 6.

In 3 steps ????