In this task, you need to count the number of times the given letter appears in the given sentence.

[EX Q]: Sentence: 'one woman is arranging the other woman's hair'. Find frequency of the letter 'o'
[EX A]: 4

[EX Q]: Sentence: 'a batter, catcher and umpire waiting for the pitch and a major league baseball game'. Find frequency of the letter 'c'
[EX A]: 3

[EX Q]: Sentence: 'a street with several cars and motorcycles riding down the street'. Find frequency of the letter 'r'
[EX A]:
6