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

[EX Q]: Sentence: 'a construction sign is displayed on a street'. Find frequency of the letter 'i'
[EX A]: 4

[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: 'a man wearing glasses pouring something into a cup being held by a blonde woman'. Find frequency of the letter 'e'
[EX A]:
6