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: 'looking through a detailed window at a clock'. How many words start with the letter 'c' in the sentence.
1

Sentence: 'cars and a motorcycle waiting at an intersection'. How many words start with the letter 'a' in the sentence.
4

Sentence: 'a bench sitting beside a window filled with greenery'. How many words start with the letter 'a' in the sentence.

2