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: 'two asian men standing next to a no smoking sign'. How many words start with the letter 's' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'the two cats are walking on the desk'. How many words start with the letter 't' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a small aircraft is sitting in a parking lot'. How many words start with the letter 's' in the sentence.

Ex Output:

2