therollingtester

import random
from string import letters

def randstr(n):
   return ''.join(random.choice(letters) for i in range(n))
#     return ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(N))

if __name__ == '__main__':
    import sys
    n = int(sys.argv[1]) if len(sys.argv) == 2 else 100