instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a golden haired dog looking out of an open window'. Find frequency of the letter 'd'
answer:
4


question:
Sentence: 'an elephant has taken a man's hat in its trunk'. Find frequency of the letter 'p'
answer:
1


question:
Sentence: 'colorful adirondack chairs at the end of a pier'. Find frequency of the letter 's'
answer:

1