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 white sink and toilet in a wood floored bathroom'. How many words start with the letter 't' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a room filled with a stove and surrounded by cabinets'. How many words start with the letter 'w' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'the stop sign and the street are covered in snow'. How many words start with the letter 's' in the sentence.

Ex Output:

4