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: 'an owner offers pizza crust to their dog'. How many words start with the letter 't' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a man and luggage carts outside of an airplane'. How many words start with the letter 'o' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a girl looks at a red tie against a bookshelf'. How many words start with the letter 'a' in the sentence.

Ex Output:

5