import sys def pol len for in range if return no return yes try print

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import sys
def pol(s):
l = len(s)
for i in range( l / 2 ):
if s[i] != s[l - i - 1]:
return "no"
return "yes"
try:
print pol(sys.argv[1])
except:
open("output.txt", "w").write( pol(open("input.txt").read()) )