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

[EX Q]: Sentence: 'pizza with different vegetables sitting on top of a wooden slab'. Find frequency of the letter 'o'
[EX A]: 5

[EX Q]: Sentence: 'some cubbies with towels in a blue bathroom'. Find frequency of the letter 'l'
[EX A]: 2

[EX Q]: Sentence: 'men in traditional red uniforms are riding black horses'. Find frequency of the letter 'a'
[EX A]:
4