TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a man paddle boarding by a boat dock in a city'. Find frequency of the letter 'o'

SOLUTION: 3

PROBLEM: Sentence: 'a little boy sitting on a bed in a bedroom'. Find frequency of the letter 'e'

SOLUTION: 3

PROBLEM: Sentence: 'the french bread pizza just came out of the oven'. Find frequency of the letter 'b'

SOLUTION:
1