compress letter rectangles by lynn

a=open('../fd/0').read().split()
t=''
c=118
while a:
 if len(set(a[-1]))>1:a=zip(*a);c^=72
 t=chr(c)+a.pop()[0]+t
print t[1:]

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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