instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a surfer wipes out on a huge wave'. Find frequency of the letter 'a'
answer:
3


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 black computer with a screen reading "press any key to begin."'. Find frequency of the letter 'a'
answer:

5