instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'there is a person standing on a blue towel'. Find frequency of the letter 'n'
answer:
4


question:
Sentence: 'two people and two children walking in a building'. Find frequency of the letter 'd'
answer:
3


question:
Sentence: 'a counter with a coffee maker and a microwave'. Find frequency of the letter 'e'
answer:

5