In this task, you need to count the number of times the given letter appears in the given sentence.
--------
Question: Sentence: 'a batter, catcher and umpire waiting for the pitch and a major league baseball game'. Find frequency of the letter 'c'

Answer: 3


Question: Sentence: 'a bunch of cows that are in the field'. Find frequency of the letter 'a'

Answer: 3


Question: Sentence: 'a group of skiers is headed towards the slope'. Find frequency of the letter 'l'

Answer:
1