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 cat standing on a suitcase and checking out peoples bags'. How many words start with the letter 's' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a bunch of people in a metropolitan area with umbrellas walking on a sidewalk next to buildings'. How many words start with the letter 'p' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a bus for bearcats basketball ohio on the road'. How many words start with the letter 'b' in the sentence.

Ex Output:

3