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 blue brick building with a man leaning on it'. How many words start with the letter 'b' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a little boy sitting at a table with a spoon full of food'. How many words start with the letter 's' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'the girl in the raincoat is posing with her umbrella'. How many words start with the letter 'h' in the sentence.

Ex Output:

1