instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a bird on a tree is flapping its wings'. Find frequency of the letter 'o'
answer:
1


question:
Sentence: 'people playing wii bowling in a modern library'. Find frequency of the letter 'o'
answer:
3


question:
Sentence: 'the man is in his bathroom busy fixing his toilet'. Find frequency of the letter 'h'
answer:

4