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

[EX Q]: Sentence: 'three woman are having a discussion in the kitchen'. Find frequency of the letter 'n'
[EX A]: 5

[EX Q]: Sentence: 'a doll with huge eyes and black hair with blunt bangs holds a red umbrella'. Find frequency of the letter 'e'
[EX A]: 5

[EX Q]: Sentence: 'horse viewed out from a bar window in a fenced in enclosure'. Find frequency of the letter 's'
[EX A]:
2