TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'there is a woman pointing at something with her dog'. Find frequency of the letter 'i'

SOLUTION: 5

PROBLEM: Sentence: 'people fishing and enlarge mountainlake with trees lining the shoreline'. Find frequency of the letter 't'

SOLUTION: 4

PROBLEM: Sentence: 'a large train is riding along the railroad tracks next to a mound of rocks'. Find frequency of the letter 'a'

SOLUTION:
8