TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a few giraffes standing in a field looking around'. Find frequency of the letter 'e'

SOLUTION: 3

PROBLEM: Sentence: 'red chair next to side table with lamp in residential home'. Find frequency of the letter 'm'

SOLUTION: 2

PROBLEM: Sentence: 'person wearing all white leaned up against a wall with a yellow sign'. Find frequency of the letter 'a'

SOLUTION:
8