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

[EX Q]: Sentence: 'a man sitting on a motorcycle near two other men'. Find frequency of the letter 'r'
[EX A]: 3

[EX Q]: Sentence: 'person wearing all white leaned up against a wall with a yellow sign'. Find frequency of the letter 'a'
[EX A]: 8

[EX Q]: Sentence: 'man hold paper heart on toothbrush, back ground out of focus'. Find frequency of the letter 'o'
[EX A]:
8