TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a baby elephant walks beside an adult elephant along a post and cable'. Find frequency of the letter 'l'

SOLUTION: 6

PROBLEM: Sentence: 'a burning wood stove has a tea pot sitting on top of it and is full of wood'. Find frequency of the letter 'a'

SOLUTION: 5

PROBLEM: Sentence: 'two women are horseback riding along a beach'. Find frequency of the letter 'a'

SOLUTION:
5