TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a bed with a mattress that has nothing on it'. Find frequency of the letter 'a'

SOLUTION: 5

PROBLEM: Sentence: 'there is no image here to provide a caption for'. Find frequency of the letter 'o'

SOLUTION: 5

PROBLEM: Sentence: 'a young man squatting next to a brick wall'. Find frequency of the letter 'q'

SOLUTION:
1