What is the serial number of the tour group computer?

The computer serial number of the tour group is the serial number of the first pinyin letter of the name of this travel agency. One column is the year, month and day, and the other column is which tour group is arranged today. The tour group number is a serial number arranged by each travel agency for its own tour group. For example, some travel agencies write the pinyin initials of the names of travel agencies and branches, the letters and dates of operators.