TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'an old woman is holding her cat in front of a camera'. Find frequency of the letter 'r'

SOLUTION: 3

PROBLEM: Sentence: 'a row of vintage cars in a grassy field'. Find frequency of the letter 'v'

SOLUTION: 1

PROBLEM: Sentence: 'there is a baseball game on and a few people are watching'. Find frequency of the letter 'i'

SOLUTION:
2