#!/usr/bin/python

import random 
import sys

a=('0670393','0670397','0670398','0670399','0670400','0670448','0670512','0670521')
b=('363563', '436243')
c=('N','M')
def generate_serial(letter='N'):
    serial = random.choice(a)+random.choice(b)+letter
    if letter=='N':
        serial+="%.2d%d" % (random.randint(1,47),random.randint(1,7))
    if letter=='M':
        serial+="%.3d" % (random.randint(523,527))
    serial+="%.9d" % (random.randrange(1,1000000000))
    print serial

args_nr = len(sys.argv)
if args_nr == 1:
    generate_serial()
elif args_nr == 2:
    if sys.argv[1]=='--help':
        print 'Usage: %s [nr of serials] [type (M or N)]' % sys.argv[0]
    else:
        for x in range(int(sys.argv[1])):
            generate_serial()
elif args_nr == 3:
    for x in range(int(sys.argv[1])):
            generate_serial(sys.argv[2])