#example of a hash function for strings (not used)
def hash4strings(st):
    """ ord(c) is the ascii value of character c
          2**120+451 is a prime number """
    s = 0
    for i in range(len(st)):
        s = (128*s + ord(st[i])) % (2**120+451)
    return s**2 % (2**120+451)


print(hash4strings("Amir"))
print(hash4strings("Benny"))
print(hash4strings("benny"))