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

[EX Q]: Sentence: 'a woman is taking a sip of a drink from a glass'. Find frequency of the letter 'i'
[EX A]: 4

[EX Q]: Sentence: 'a kitchen with hanging lights, an island with sink and bar stools, a refrigerator, small pantry door, wooden cabinets and shiny wood floor'. Find frequency of the letter 'n'
[EX A]: 12

[EX Q]: Sentence: 'a girl is eating a slice of pizza'. Find frequency of the letter 'a'
[EX A]:
4