TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'there is a stop sign that has a reflection in a puddle'. Find frequency of the letter 'e'

SOLUTION: 5

PROBLEM: Sentence: 'this is a close up view of a tennis player during the game'. Find frequency of the letter 't'

SOLUTION: 3

PROBLEM: Sentence: 'a white plate with a fork and a black plate with a pizza'. Find frequency of the letter 'b'

SOLUTION:
1