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

[EX Q]: Sentence: 'hand holding a white calculator inside a store'. Find frequency of the letter 'o'
[EX A]: 3

[EX Q]: Sentence: 'a castle like bed room that has the era of templar knight similarities'. Find frequency of the letter 'm'
[EX A]: 3

[EX Q]: Sentence: 'a black bird that is sitting on a branch'. Find frequency of the letter 'a'
[EX A]:
5