TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a woman in a messy kitchen with a child'. Find frequency of the letter 'a'

SOLUTION: 4

PROBLEM: Sentence: 'a man hitting a tennis ball with a tennis racquet'. Find frequency of the letter 't'

SOLUTION: 6

PROBLEM: Sentence: 'a person driving an old car down a street during a gay pride parade'. Find frequency of the letter 'v'

SOLUTION:
1