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Please Help Approval Process - different user in different step of same approval process

I had an approval process which contains two steps,
each step has been assigned to same queue
how can i set up the criteria not allow user do the approval in the second step, if he/she already approved in first step
For example
Person A, B, C in this approval Queue
Person A approved in Step 1,
Person A is not allow to approve this again in step 2, as he/she already approved in step 1
How can i set up this sinario: different user in the same queue to approval for the same approval request in different step?
much appricated thanks in advance