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

[EX Q]: Sentence: 'a man in a sweatshirt is taking his own picture'. Find frequency of the letter 'u'
[EX A]: 1

[EX Q]: Sentence: 'this marketplace has a lot of fresh fruit and vegetables'. Find frequency of the letter 'v'
[EX A]: 1

[EX Q]: Sentence: 'a glass vase sits between two statues'. Find frequency of the letter 'o'
[EX A]:
1