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 is taking a sip of a drink from a glass'. Find frequency of the letter 'i'

SOLUTION: 4

PROBLEM: Sentence: 'small black bird with red on its head standing on a tree branch'. Find frequency of the letter 'b'

SOLUTION: 3

PROBLEM: Sentence: 'a blue plate with an orange a cracker some lettuce and a twist bar'. Find frequency of the letter 'r'

SOLUTION:
4