instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a picture of a machine built next to a street'. Find frequency of the letter 'x'
answer:
1


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


question:
Sentence: 'bunch of dumbass zebras roaming the prairie and shitting'. Find frequency of the letter 't'
answer:

3