TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'three woman are having a discussion in the kitchen'. Find frequency of the letter 'n'

SOLUTION: 5

PROBLEM: Sentence: 'a black bear sitting in the grass taking a rest'. Find frequency of the letter 'a'

SOLUTION: 6

PROBLEM: Sentence: 'a person standing on a chair while holding their laptop above their head'. Find frequency of the letter 'h'

SOLUTION:
6