TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a tower with some bright lights and clocks on it'. Find frequency of the letter 'h'

SOLUTION: 3

PROBLEM: Sentence: 'a long row of tables displaying lots of fruit'. Find frequency of the letter 'o'

SOLUTION: 5

PROBLEM: Sentence: 'the man is doing skateboard tricks in front of an audience'. Find frequency of the letter 'a'

SOLUTION:
5