How to save a keyboard input from the user in a .CSV file ?

Question

Hello!


I'm having problem writing to a .CSV file the input of the keyboard the user is entering.

I have a form with just a changing photo in it, and there is a time interval of 4Sec to enter an answer (yes/no). (let's say that, yes is keyword: D | no is keyword: k)

In the .CSV file:
Every column represents a different photo, meaning, when the time interval is done, the next input of from the user will be written in the next following column.

2. Every row is a different user.


Many thanks!