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A spiral of numbers can start and end with any positive integers less than $100$. Write a program which will accept two positive integers $x$ and $y$ as input, and output a list of numbers from $x$ to $y$ inclusive, shown in a spiral. You may assume that the end value is greater than or equal to the start value.
A spiral starts with the first number in the centre. The next number appears immediately below the first number. The spiral continues with the numbers increasing in a counter-clockwise direction until the last number is printed.
10 27
27 26 16 15 14 25 17 10 13 24 18 11 12 23 19 20 21 22
7 12
12 11 7 10 8 9