TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a woman at a table checking her cell phone'. Find frequency of the letter 'a'

SOLUTION: 5

PROBLEM: Sentence: 'there is a stop sign that has a reflection in a puddle'. Find frequency of the letter 'e'

SOLUTION: 5

PROBLEM: Sentence: 'a man playing soccer with a group of kids on a field'. Find frequency of the letter 'y'

SOLUTION:
1