def isValidNumberPlate(number_plate):
if len(number_plate) != 7:
return False
if (number_plate[0:2].isalpha() and number_plate[2:4].isdigit() and number_plate[4:].isalpha()):
return True
return False
print isValidNumberPlate('GT45HOK')
print isValidNumberPlate('GT5HYKU')
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