To record leave or on-duty students, enter the student roll numbers separated by spaces in the input box and click "Confirm Leave" or "Confirm On Duty" and then press "Print Attendance".
For example, to record leave for students with roll numbers 1, 3, and 5, enter 1 3 5 in the leave input box and click "Confirm Leave" and then press "Print Attendance".
If it shows "The input contains invalid indices. Please re-enter the input," it's because you entered the same roll number in both absences and on duty.