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

[EX Q]: Sentence: 'a man riding on the back of a white horse next to other horses'. Find frequency of the letter 'o'
[EX A]: 6

[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: 'dark clouds cover mountains , a ,body of water and sheep standing on grassy land '. Find frequency of the letter 'e'
[EX A]:
4