# import argv so that commandline argument can be accessed
from sys import argv

# load contents of the input file into the variable `input'
inputFileName = argv[1]
with open(inputFileName) as inputFile:
    input = inputFile.read()

# Python program containsZ.py
if "Z" in input:
    print "yes"
else:
    print "no"
##end-of-program##
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