instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a toilet filled with a brown liner and dirty water'. Find frequency of the letter 't'
answer:
5


question:
Sentence: 'a person riding a camel in front of a truck'. Find frequency of the letter 't'
answer:
2


question:
Sentence: 'a bathroom has urinals, a brick wall, and a small sink'. Find frequency of the letter 'w'
answer:

1