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

[EX Q]: Sentence: 'a boy that is sitting at a table with pizza'. Find frequency of the letter 's'
[EX A]: 2

[EX Q]: Sentence: 'a bowl of granola, dried fruit, and bananas'. Find frequency of the letter 'u'
[EX A]: 1

[EX Q]: Sentence: 'a commercial jet is on an airport tarmac'. Find frequency of the letter 'i'
[EX A]:
3