i need solution for this question digital logic

2) Consider a digital system connected to four switches named S3, S2, S1 and SO and two LEDs L1 and L2. When a switch is closed, the system receives from it the binary value 1. When a switch is open, the system receives from it the binary value 0. A LED turns ON if it receives the binary value 1 and it turns OFF if it receives the binary value 0. a. Determine the number of inputs and outputs for this system b. Put the truth table of this system assuming that: i. L1 turns ON if and only if S2 and Sl are closed but not SO ii. L2 turns ON if and only if S2 and So are closed but not Si nor S3