instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a sheep in a field in front of other sheep'. Find frequency of the letter 'f'
answer:
3


question:
Sentence: 'a man and a woman are walking down the street with an umbrella over their heads'. Find frequency of the letter 'w'
answer:
4


question:
Sentence: 'a man making a creepy face while wearing a red bow tie'. Find frequency of the letter 'd'
answer:

1