I am trying to write a program that accepts a phone number in the format `XXX-XXX-XXXX` and translates any letters in the entry to their corresponding numbers. 

Now I have this, and it will allow you to reenter the correct number if its not correct to start, but then it translates the original number entered. how do i fix this?

```
def main():
    phone_number= input('Please enter a phone number in the format XXX-XXX-XXXX: ')
    validNumber(phone_number)
    translateNumber(phone_number)

def validNumber(phone_number):
for i,c in enumerate(phone_number):
    if i in [3,7]:
        if c != '-':
            phone_number=input('Please enter a valid phone number: ')
        return phone_number
    elif not c.isalnum():
        phone_number=input('Please enter a valid phone number: ')
        return phone_number
return phone_number

def translateNumber(phone_number):
    s=""
    for char in phone_number:
        if char is '1':
            x1='1'
            s= s + x1
        elif char is '-':
            x2='-'
            s= s + x2
        elif char in 'ABCabc':
            x3='2'
            s= s + x3
        elif char in 'DEFdef':
            x4='3'
            s= s + x4
        elif char in 'GHIghi':
            x5='4'
            s= s + x5
        elif char in 'JKLjkl':
            x6='5'
            s= s + x6
        elif char in 'MNOmno':
            x7='6'
            s= s + x7
        elif char in 'PQRSpqrs':
            x8='7'
            s= s + x8
        elif char in 'TUVtuv':
            x9='8'
            s= s + x9
        elif char in 'WXYZwxyz':
            x10='9'
            s= s + x10
    print(s)

```