How do I indicate the number and series of my birth certificate when buying a ticket online?

How to enter the number and series of a birth certificate when buying a ticket online?

Enter the series and document number in the field, replacing Russian letters with Latin letters. For example, IV-ЖА is entered as IVZHA. If you are unsure about entering the series and number correctly in Latin, write them in Russian. Once you start typing, a hint with the correct transliteration will appear. Click on it — the letters will be automatically filled in.

The format for entering the number of a birth certificate issued in the Russian Federation (RF): Series: Roman numerals (must be typed in the Latin register using the letters I, V, X), two letters using the Russian keyboard layout, number: 6 (six) digits. Dashes and spaces are irrelevant.