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

[EX Q]: Sentence: 'two elephants walking on cement next to wall'. Find frequency of the letter 'n'
[EX A]: 5

[EX Q]: Sentence: 'the skateboarder is jumping over a huge statue of a shoe'. Find frequency of the letter 'i'
[EX A]: 2

[EX Q]: Sentence: 'the corner of the avenues of the americas and 6th avenue'. Find frequency of the letter 'h'
[EX A]:
4