# Enter a program using 1s and 0s, followed by a newline. Then input newlines to
# continue exectution and/or EOFs to end.
/^=x//
/=9./=9/
/^(.*)=x/>$1/
/=1/!
  /1/I/
  /0/O/
/=1/=x/!
  /^[OI](.*?)>O(.*)$/$1O>$2=x$1O>$2/
  /^(.*?)>I([OI])(.*)$/$1I$2>$3$2=x$1I$2>$3$2/
  /^(.*)>$/>$1=x>$1/
  /^>O(.*)$/>$1=x>$1/
  /^([OI])(.*)>I$/$1>$2I$1=x$1>$2I$1/
/=1/*
  /=1//
.