import string

keyPad = ['','','abc','def','ghi','jkl','mno','pqrs','tuv','wxyz']
myFile = open("phoneNumbers.txt","rU")

for pos, var in enumerate(keyPad):
    for line in myFile:
        line = line.lower()
        for char in line:
            if char in string.ascii_lowercase:
                #line.replace(char, pos)