TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a man that is on his cell phone'. Find frequency of the letter 's'

SOLUTION: 2

PROBLEM: Sentence: 'four women around a man sitting in front of a cake'. Find frequency of the letter 'o'

SOLUTION: 5

PROBLEM: Sentence: 'man holding a baby while on a computer'. Find frequency of the letter 'l'

SOLUTION:
2