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 passenger train that is passing under some blue bars'. How many words start with the letter 'u' in the sentence.
1

Sentence: 'a living room with hd tv chair and decorations'. How many words start with the letter 'r' in the sentence.
1

Sentence: 'a grizzly bear sitting on a grassy slope'. How many words start with the letter 's' in the sentence.

2