Magic Trick solutions

Magic Trick was solved using Scheme by 8 contestants. Solution sizes: average 3353 bytes (shortest: 518; longest: 18675).

450.

mhw (833 B)
4441.

domob (1907 B)
9966.

nalaginrut (882 B)
9992.

k6ky (769 B)
19889.

thiro (518 B)

20722.

count.1 (1486 B)
21906.

Pla (1757 B)
24892.

TeeJay (18675 B)