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

[EX Q]: Sentence: 'girls posing of a picture one holding a tennis racket the other wearing a crown'. Find frequency of the letter 'g'
[EX A]: 4

[EX Q]: Sentence: 'a lady mixes some things in a blender as people look on'. Find frequency of the letter 'i'
[EX A]: 3

[EX Q]: Sentence: 'a crisp clean white bathroom includes a large mirror and a walnut cabinet'. Find frequency of the letter 'c'
[EX A]:
4