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 train moves across a train crossing in a city'. How many words start with the letter 'c' in the sentence.
2

Sentence: 'a group of people sitting at a restaurant table'. How many words start with the letter 'a' in the sentence.
3

Sentence: 'a white glass vase filled with flowers on top of a table'. How many words start with the letter 'o' in the sentence.

2