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

[EX Q]: Sentence: 'a lady mixes some things in a blender as people look on'. Find frequency of the letter 'i'
[EX A]: 3

[EX Q]: Sentence: 'two women standing next to each other holding tennis rackets'. Find frequency of the letter 't'
[EX A]: 7

[EX Q]: Sentence: 'a round white plate on a table that has french fries, coleslaw and a sandwich cut in half'. Find frequency of the letter 'a'
[EX A]:
11