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: 'birds are standing in a row on a wooden railing'. How many words start with the letter 'a' in the sentence.
[A]: 3


[Q]: Sentence: 'a train traveling through a tunnel on a model track'. How many words start with the letter 'a' in the sentence.
[A]: 3


[Q]: Sentence: 'living room with mirror on floor by couch'. How many words start with the letter 'f' in the sentence.
[A]:
1