Hi!
Could you can refine the task.
In code
TYPE Statetype IS (A, B, C, D, E, F, G, H, I);
so A-I are state of FSM.
X1 -X10 are also the states of machine, because
IF (DIN = '1') THEN state <= B;
ELSE state <= X1;
The X1 -X10 variables can be set to any values from A to I. Maybe X9 or X10 should be A if you want that FSM return to initial A state.
If you need exactly mapping X1-X10 to A-I, then one VHDL-code is not enough