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: 'people in a field are looking up at a kite'. How many words start with the letter 'u' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'a red passenger train traveling passed a large tourist building'. How many words start with the letter 't' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'a sausage in a bun and assorted vegetables'. How many words start with the letter 'a' in the sentence.
[EX A]:
4