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

[Q]: Sentence: 'a young girl is brushing her teeth in this dated photo'. Find frequency of the letter 't'
[A]: 5


[Q]: Sentence: 'a surfer is in the middle of an ocean wave'. Find frequency of the letter 'i'
[A]: 3


[Q]: Sentence: 'a mini double decker bus getting ready to pick up people'. Find frequency of the letter 'p'
[A]:
4