instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a room with a big screen television and a couch'. Find frequency of the letter 'h'
answer:
2


question:
Sentence: 'a picture of two computers on a table'. Find frequency of the letter 'r'
answer:
2


question:
Sentence: 'the snowboarder jumps atop the striped board in the snowy area'. Find frequency of the letter 'a'
answer:

5