13 lines
214 B
Python
13 lines
214 B
Python
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#!/usr/bin/env python
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import sys
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buf = sys.stdin.buffer.read()
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buf = buf.strip(b'\n')
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for i, b in enumerate(buf):
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b = b - i
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if b < 0:
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b = 255 + b
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sys.stdout.buffer.write(b.to_bytes())
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print()
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