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: 'a baby elephant walks beside an adult elephant along a post and cable'. Find frequency of the letter 'l'
[EX A]: 6

[EX Q]: Sentence: 'a clock tower on the top of a building'. Find frequency of the letter 'c'
[EX A]:
2