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

[EX Q]: Sentence: 'a group of people seated in chairs together and facing the same direction, with one man holding a soccer ball in his hands'. Find frequency of the letter 'm'
[EX A]: 2

[EX Q]: Sentence: 'a woman in yellow dress standing next to a horse'. Find frequency of the letter 'l'
[EX A]: 2

[EX Q]: Sentence: 'one news anchor looks angry while the other looks concerned about the large cat story they're talking about'. Find frequency of the letter 's'
[EX A]:
4