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.

Sentence: 'a man pitching a baseball from a mound to a home plate'. How many words start with the letter 'a' in the sentence.
4

Sentence: 'woman riding on the back of a horse inside a building'. How many words start with the letter 'o' in the sentence.
2

Sentence: 'a group of women with umbrellas and a couple without umbrellas outside in the rain'. How many words start with the letter 'c' in the sentence.

1