#CHECK MOBILE NUMBER.PY BY GEORGE SKOUROUPATHIS
import re

pattern = '''
^   #start of file
9   #first 9
(9|7|6) #9 or 7 or 6
\\d{6}  #6 digits
$   #eof
'''

number = ""
while number != "exit":
    number = raw_input("Type a mobile number. (type 'exit' to quit the program): ")
    if number == "exit":
        print "Goodbye user..."
        print ""
        print "Coding by George Skouroupathis"
        testword = raw_input("(Press Enter to Quit)")
    else:
        if re.search(pattern, number, re.VERBOSE) != None:
            print "O - Valid mobile number"
        else:
            print "X - Invalid mobile number"