instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'three people are gathered around sitting on a park bench'. Find frequency of the letter 'g'
answer:
2


question:
Sentence: 'a truck is parked in front of a store'. Find frequency of the letter 't'
answer:
3


question:
Sentence: 'a group of boys playing soccer against each other'. Find frequency of the letter 'o'
answer:

5