Answer:
The addition to the program is as follows: digit = 0
while digit <= 9:
print('%s%d.com' % (letter1, digit))
digit+=1
Explanation:
This initializes digit to 0
digit = 0
This loop is repeated from 0 to 9 (inclusive)
while digit <= 9:
This prints the domain (letter and digit)
print('%s%d.com' % (letter1, digit))
This increases the digit by 1 for another domain
digit+=1
See attachment for complete program