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

[Q]: Sentence: 'a bunch of people are standing out in a field a red one has their arms out as a white ball is in the air'. Find frequency of the letter 'e'
[A]: 9

[Q]: Sentence: 'a red building with a crowd of people outside it near the water'. Find frequency of the letter 'e'
[A]: 7

[Q]: Sentence: 'a kitchen with wood cabinets, stainless steel oven, stainless steel microwave and a refrigerator and a hole where the cooktop goes'. Find frequency of the letter 'l'
[A]:
5