TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a picture of two men on a motorcycle in front of a railroad track'. Find frequency of the letter 'n'

SOLUTION: 4

PROBLEM: Sentence: 'a man swinging a bat while playing baseball'. Find frequency of the letter 'm'

SOLUTION: 1

PROBLEM: Sentence: 'a boy in white shirt doing a trick on a skateboard'. Find frequency of the letter 'k'

SOLUTION:
2