instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'an area that has surrounded by a metal fence'. Find frequency of the letter 'o'
answer:
1


question:
Sentence: 'a gray colored pigeon that is perched on a railing outside of a building, with other buildings in the background'. Find frequency of the letter 'e'
answer:
7


question:
Sentence: 'a man holding a brown paper bag kite'. Find frequency of the letter 'b'
answer:

2