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#!/usr/bin/python
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from sys import stdin, stdout
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while True:
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c = stdin.read(2)
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if len(c) < 2:
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break
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n1, n2 = ord(c[0]), ord(c[1])
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stdout.write(chr(((n2 & 15) << 4) + ((n2 & 240) >> 4)))
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stdout.write(chr(((n1 & 15) << 4) + ((n1 & 240) >> 4)))
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