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

[Q]: Sentence: 'an elephant with broken tusks stands in front of a hill and boulders'. Find frequency of the letter 'n'
[A]: 7


[Q]: Sentence: 'some people sitting on surfboards in the water'. Find frequency of the letter 't'
[A]: 4


[Q]: Sentence: 'a person holding a doughnut in their left hand'. Find frequency of the letter 'g'
[A]:
2