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

[EX Q]: Sentence: 'a white and blue plate topped with meat and a salad'. Find frequency of the letter 'u'
[EX A]: 1

[EX Q]: Sentence: 'a truck is parked in front of a store'. Find frequency of the letter 't'
[EX A]: 3

[EX Q]: Sentence: 'a bathroom with a shower next to a large mirror'. Find frequency of the letter 'a'
[EX A]:
5