On the website
tax you can send a request to find out your INN. When filling out line by series and number passport issue:
The field "number of document" is not in the format "R-BB 999999", where:
R — Roman number specified by the characters "I", "V", "X", "L", "C", written in upper case Latin keyboard
B — any Russian uppercase letter;
9 — any decimal digit (required).
What is wrong here?