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 Q]: Sentence: 'a close up of a baby with a tooth brush'. How many words start with the letter 'a' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'a road with a crosswalk in the middle of it'. How many words start with the letter 't' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'a small dog with some glasses over its eyes'. How many words start with the letter 'o' in the sentence.
[EX A]:
1