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

[EX Q]: Sentence: 'a picture of two men on a motorcycle in front of a railroad track'. Find frequency of the letter 'n'
[EX A]: 4

[EX Q]: Sentence: 'group of snowboarders on a snowy trail overlooking a mountain'. Find frequency of the letter 'r'
[EX A]: 5

[EX Q]: Sentence: 'a metallic stove top oven inside of a wooden kitchen'. Find frequency of the letter 'v'
[EX A]:
2