Design a coding scheme to code every student in the class, requiring that the number of each student is not repeated, and the student can be clearly seen from each number.

The code can use five digits; Among them, the first two represent classes, the third and fourth represent student numbers, the last one represents gender, 1 represents boys, and 2 represents girls;

For example, the number of No.34 girl in Class Two, Grade Five is: 52342;

The number of the boy 18 in Class 3, Grade 6 is 63 18 1.