instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'three elephants walk up a dirt trail from the water'. Find frequency of the letter 'l'
answer:
3


question:
Sentence: 'baseball player reaching back as he's about to throw the ball'. Find frequency of the letter 'e'
answer:
5


question:
Sentence: 'a very clean toilet with the lid up next to toilet paper'. Find frequency of the letter 'l'
answer:

4