BrihtnaBuca

#!/usr/bin/python

import sys

def sub(x):
    r = 255 - ord(x)
    if r<0: r += 2**16
    return unichr(r)

a = sys.stdin.read().decode("utf-8")
b = a[::2] + a[-1-(len(a)%2)::-2]
c = map(sub, b)

print u"".join(c).encode("utf-8")

# Example usage:
# wget -qO- "http://www.promet.si/rwproxy/RWProxy.ashx?method=GET&rproxytype=json&remoteUrl=http%3A//promet/counters_si" | python promet.py