nato = True
while nato:
    word = input("Enter a word: ").upper()
    try:
        nato_list = [nato_dict[letter] for letter in word]
    except KeyError:
        print("Sorry, only letters in the alphabet please.")
    else:
        print(nato_list)
        nato = False

def generate_phonetic():
		word = input("Enter a word: ").upper()
		try:
		    nato_list = [nato_dict[letter] for letter in word]
		except KeyError:
		    print("Sorry, only letters in the alphabet please.")
				generate_phonetic()
		else:
		    print(nato_list)