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

[EX Q]: Sentence: 'a woman standing in front of a bathroom sink in front of a mirror'. Find frequency of the letter 'o'
[EX A]: 8

[EX Q]: Sentence: 'man is snow gear and skis skiing in the snow'. Find frequency of the letter 'i'
[EX A]: 5

[EX Q]: Sentence: 'people are lined up and waiting for baggage'. Find frequency of the letter 'o'
[EX A]:
2