instruction:
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.
question:
Sentence: 'a cat sitting on a pan in an oven'. How many words start with the letter 'a' in the sentence.
answer:
3


question:
Sentence: 'a man in red and black jacket snowboarding on slope'. How many words start with the letter 'o' in the sentence.
answer:
1


question:
Sentence: 'a mother bear and her two young are crossing a shallow river'. How many words start with the letter 'a' in the sentence.
answer:

4