wordList = []
b = 1
while b == 1:
    listInput = input("Enter a word or Press enter to list words: ")
    if listInput != "":
        TempWord = list(listInput.lower())
        FirstLetter = TempWord[0]
        if TempWord.count(FirstLetter) > 1:
            wordList.append(listInput)
        else:
            continue
    elif listInput == "":
        for a in range(0, len(wordList)):
            print(wordList[a])
            b = 0