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 dog on one side of a glass door and a cat on the other side'. How many words start with the letter 'a' in the sentence.
answer:
4


question:
Sentence: 'a group of people standing around an airplane on top of a field'. How many words start with the letter 'a' in the sentence.
answer:
5


question:
Sentence: 'a large plane sitting on a landing strip next to a body of water'. How many words start with the letter 'o' in the sentence.
answer:

2