How can I add the ruble icon to the number in the input?

Question

css

There is a regular input - link , you need to add an icon so that it moves to the right depending on the field being filled.
You cannot insert it into the value of the input.
How can this problem be solved?
Can it be solved with after and attr ? (the icon must be movable)

Example:

Answer 1

Just to tweak, quickly sketched