TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a guy riding a bike close to a car in the street'. Find frequency of the letter 'i'

SOLUTION: 4

PROBLEM: Sentence: 'a woman standing in front of a bathroom sink in front of a mirror'. Find frequency of the letter 'o'

SOLUTION: 8

PROBLEM: Sentence: 'an old polaroid picture of a girl lying on a bed reading a newspaper'. Find frequency of the letter 'i'

SOLUTION:
5