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: 'one woman holding a video game controller and standing next to another woman'. Find frequency of the letter 't'
answer:
5


question:
Sentence: 'an old, run down city bus sits parked, with rust'. Find frequency of the letter 'h'
answer:

1