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 white and blue plate topped with meat and a salad'. Find frequency of the letter 'u'
[EX A]: 1

[EX Q]: Sentence: 'there are three zebras are walking in a field'. Find frequency of the letter 'e'
[EX A]:
8