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

[EX Q]: Sentence: 'a person that is looking out his window'. Find frequency of the letter 'n'
[EX A]: 3

[EX Q]: Sentence: 'a man sitting on a motorcycle near two other men'. Find frequency of the letter 'r'
[EX A]: 3

[EX Q]: Sentence: 'several fishing boats docked in a water canal'. Find frequency of the letter 'f'
[EX A]:
1