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). c) A transducer that converts a binary string to an octal number, you can assume that the input is read from right to left. Note that the length of the binary string might not be divisible by 3 . 1100=>14