instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a black horse with a white dot on its forehead'. Find frequency of the letter 't'
answer:
4


question:
Sentence: 'a group of men standing on the side of a boat'. Find frequency of the letter 'o'
answer:
5


question:
Sentence: 'a baseball player swinging a bat during a game'. Find frequency of the letter 'n'
answer:

3