Write a function named initialDict that takes a string, text, as a parameter and computes and returns a dictionary in which each initial letter of a word in text is a key. All keys should be lower cased. The value of each key is a list of all words in text beginning with that letter.

Input: text, a string

Return: a dictionary of initial letter:word list pairs

For example, the following would be correct output.

print(initialDict('The Call of the Wild'))

{'c': ['Call'], 't': ['The', 'the'], 'w': ['Wild'], 'o': ['of']}