phone number, to letters conversion

[Gribouillis]

The whole block of code from line 57 to 77 can now be replaced with

list_cnvrt.extend(list_tuple[int(number)] for number in list_numbers)

and if you write from itertools import product at the top, the huge block of for statements near the end can be replaced with

for A, B, C, D, E, F, G in product(*list_cnvrt):
    print ("(",(cnt),")  ",(A)+(B)+(C)+(D)+(E)+(F)+(G))
    print("")
    cnt=cnt+1

You could even write

for cnt, p in enumerate(product(*list_cnvrt), 1):
    print("({}) {}".format(cnt, sum(p)))