instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a red and white train passing a train station'. Find frequency of the letter 'a'
answer:
7


question:
Sentence: 'a man that is on his cell phone'. Find frequency of the letter 's'
answer:
2


question:
Sentence: 'that looks like a huge jump on the snow'. Find frequency of the letter 's'
answer:

2


