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.

[Q]: Sentence: 'a man holding up a smart phone with both hands'. How many words start with the letter 'm' in the sentence.
[A]: 1


[Q]: Sentence: 'the pigeons are walking around in the park around the benches'. How many words start with the letter 'b' in the sentence.
[A]: 1


[Q]: Sentence: 'a red and white navy airplane ready to take off'. How many words start with the letter 'r' in the sentence.
[A]:
2