In this task, you need to count the number of times the given letter appears in the given sentence.

[EX Q]: Sentence: 'a large grass pasture land with sheep grazing on grass'. Find frequency of the letter 'a'
[EX A]: 7

[EX Q]: Sentence: 'a gray colored pigeon that is perched on a railing outside of a building, with other buildings in the background'. Find frequency of the letter 'e'
[EX A]: 7

[EX Q]: Sentence: 'the ghost is holding a cocktail umbrella over the villain'. Find frequency of the letter 'l'
[EX A]:
6