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: 'a teddy bear is sitting on a heart shaped patio chair outside'. Find frequency of the letter 'i'
[EX A]: 6

[EX Q]: Sentence: 'a man sticking two hot dogs into his mouth as he holds the bun in his other hand'. Find frequency of the letter 'n'
[EX A]:
6