TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a herd of giraffes in tall african grass'. Find frequency of the letter 'a'

SOLUTION: 6

PROBLEM: Sentence: 'a man flying through the air on top of a skateboard'. Find frequency of the letter 'r'

SOLUTION: 3

PROBLEM: Sentence: 'a stoplight on a street corner beside small houses'. Find frequency of the letter 'i'

SOLUTION:
2