Pronouncable Name Generator

import random
consonants = (66,67,68,70,71,72,74,75,76,77,78,\
80,81,82,83,84,86,87,88,89,90)
vowels = (65,69,73,79,85)
while True:
    try:
        letters = int(input("Enter a number: "))
        break
    except ValueError:
        print("That is not a valid entry.")
tupword = []
if random.randrange(1,3) == 1:
    consonant = 1
else:
    consonant = 0
while letters > 0:
    if consonant == 1:
        tupword.append(chr(random.choice(consonants)))
        consonant = 0
        letters  -= 1
    else:
        tupword.append(chr(random.choice(vowels)))
        consonant = 1
        letters -= 1
word = ''.join(str(v) for v in tupword)
print(word)