instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'man in air skateboarding on street with building'. Find frequency of the letter 't'
answer:
4


question:
Sentence: 'the counter of a doctor's office, including a laptop, cotton swabs, and tongue depressors'. Find frequency of the letter 'g'
answer:
2


question:
Sentence: 'two teams of baseball players engaged in a game'. Find frequency of the letter 'm'
answer:

2