TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'seagulls sit on the posts of a seaside balcony by a clock tower'. Find frequency of the letter 'g'

SOLUTION: 1

PROBLEM: Sentence: 'a baseball player dropping his bat and starting to run'. Find frequency of the letter 'o'

SOLUTION: 2

PROBLEM: Sentence: 'two giraffes out in the sun either in a zoo or in the wild'. Find frequency of the letter 'u'

SOLUTION:
2