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 guy squatting down and tapping his food with a woman sitting down'. How many words start with the letter 'f' in the sentence.

Ex Output:
1

Ex Input:
Sentence: 'a bed sitting next to a window with a wooden headboard'. How many words start with the letter 'a' in the sentence.

Ex Output:
3

Ex Input:
Sentence: 'a double wood table in a cluttered room with a plant in the middle of the table'. How many words start with the letter 'a' in the sentence.

Ex Output:
3