TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'two people wearing snowboards sitting on a snowy slope'. Find frequency of the letter 's'

SOLUTION: 5

PROBLEM: Sentence: 'a group of giraffes walk together by a hill'. Find frequency of the letter 'b'

SOLUTION: 1

PROBLEM: Sentence: 'some baseball players are playing baseball on a field'. Find frequency of the letter 'l'

SOLUTION:
7