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 group of young people riding snow boards down a snow covered hillside'. How many words start with the letter 'a' in the sentence.

A: 2
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Q: Sentence: 'a door is closed with a sign on it glass cover'. How many words start with the letter 'a' in the sentence.

A: 2
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Q: Sentence: 'a woman under a yellow umbrella with a laptop'. How many words start with the letter 'u' in the sentence.

A:
2
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