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 sitting next to boxes of produce sitting in front of a store'. How many words start with the letter 's' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'two packaged frozen pizzas that are on a cookie sheet and the boxes behind the pizzas'. How many words start with the letter 't' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a plate topped with small sandwiches with meat and veggies'. How many words start with the letter 's' in the sentence.

Ex Output:

2