In this task, you need to count the number of words in a sentence that start with the given letter. Answer with numbers and not words.

Ex Input:
Sentence: 'a young kid in a hat with a parrot on his shoulder'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a dog is laying down on a small couch'. How many words start with the letter 'a' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a white dog laying in an open suitcase'. How many words start with the letter 'i' in the sentence.

Ex Output:

1