" No-op
. Wall
= Push 0
0-9 Mul 10 and add 0-9
~ Pop and discard
$ Dup
> Move front to rear (rotate right once)
< Move rear to front (rotate left once)
[ Move to previous deque
] Move to next deque
{ Carry 1 to previous deque
} Carry 1 to next deque
+-*/%! add sub mul div mod not
^ neg
)( inc dec
;`:' numin charin numout charout
_\ space newline
& debug; dump current deque as space-separated numbers
# height
@ halt
? random in [0, n)