Create a woodpecker script that takes 16-bit a and calculates the 16-bit modular inverse modulo 2**16 - 17 (65519) pow(a, -1, 2**16-17).
1<=a<65519 is guaranteed.
<low a hi> | <low output hi>
-----------------------------------
1000000000000000 | 1000000000000000
0010000000000000 | 0011111111111100
1010001000000000 | 0000001110101101
0111011111111111 | 0111011111111111