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

[Q]: Sentence: 'an old boat on a beach near a large body of water'. Find frequency of the letter 'a'
[A]: 8


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


[Q]: Sentence: 'a woman is looking at sheep off in a field'. Find frequency of the letter 'm'
[A]:
1