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

[EX Q]: Sentence: 'two giraffes standing next to some trees'. Find frequency of the letter 'f'
[EX A]: 2

[EX Q]: Sentence: 'a dilapidated bench in a park under a tree'. Find frequency of the letter 'p'
[EX A]: 2

[EX Q]: Sentence: 'a toilet sitting in a recess of the bathroom wall'. Find frequency of the letter 'o'
[EX A]:
4