Urgent, 5 people work 12 hour day shift, and 4 people work 1 person 1 night shift. How to arrange overtime at least?

No matter how it is arranged, it is clear that the total length of overtime hours for all people cannot be changed. If it is to make a person work less overtime, then a person must work longer, which is unfair. So I can't arrange it. So it is better to take turns. The following is the rotation table: