In the programs I have made when I use the Request

Hello,
The syntax of the command is as follows
:Request Message, VarName
where Message is a character string containing the message that will be displayed as a prompt, and VarName is the name of the string variable where the input will be stored.
If you want to input a numerical value you must convert it from character string to a numerical value (I know, it is like splitting hair but string 123456 is not the same as number 123456)
You convert from string to numerical value with the expr() command.
Exemple:
:Request "Value of a? ", s
:expr(s) --> a

That should do it.

Hope it helps.