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 herd of elephants with large and small elephants at the zoo'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a person standing on a tennis court holding a tennis racket'. How many words start with the letter 'c' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a man skiing down a mountain on a sunny day'. How many words start with the letter 'm' in the sentence.

Ex Output:

2