please show me step by step solution, thank you.

Q4- Design a Finite State Machine (FSM) (a.k.a transducer) for each of the followings. For all of them consider that the end of inputs is marked with blanks (Bs). a) A transducer that receives two binary strings as inputs and output the result of the subtraction of the second one from the first one. You can assume that the input is read from right to left (The least significant digit to the most significant digit), and the first number is always greater than or equal to the second number. Note that the two strings might not have the same length