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

[EX Q]: Sentence: 'a woman holds some baked goods at the convention'. Find frequency of the letter 'd'
[EX A]: 3

[EX Q]: Sentence: 'a bunch of cows that are in the field'. Find frequency of the letter 'a'
[EX A]: 3

[EX Q]: Sentence: 'a young child sitting on the floor with a remote'. Find frequency of the letter 's'
[EX A]:
1