TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
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: 'a woman swinging a tennis racquet towards a tennis ball'. Find frequency of the letter 'e'

SOLUTION: 3

PROBLEM: Sentence: 'cat laying in hammock made from a chair and blanket'. Find frequency of the letter 'i'

SOLUTION:
3