import sys r=list(sys.stdin) p=500 t=['']*p*2 s='A' while'#'<s:t[p],d,s=r[int(t[p]or 0)+1][ord(s)-64<<2:][:3];p+=ord(d)-61 print''.join(t)
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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