TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'three birds are sitting on a tree in a forest'. Find frequency of the letter 'h'

SOLUTION: 1

PROBLEM: Sentence: 'a man with a large grey and black beard and glasses and a tie'. Find frequency of the letter 'e'

SOLUTION: 5

PROBLEM: Sentence: 'two men are playing a game with controllers'. Find frequency of the letter 't'

SOLUTION:
3