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

[EX Q]: Sentence: 'a young elephant is touching a bigger elephant with its trunk'. Find frequency of the letter 'i'
[EX A]: 5

[EX Q]: Sentence: 'vanity sitting atop a base with two doors and a mirror overhead'. Find frequency of the letter 'n'
[EX A]: 3

[EX Q]: Sentence: 'a long haired man is sitting in a recliner playing video games'. Find frequency of the letter 'g'
[EX A]:
4