instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'many white birds flying above a river that flows in front of a forest'. Find frequency of the letter 'a'
answer:
5


question:
Sentence: 'a boy swinging a bat while playing baseball'. Find frequency of the letter 'h'
answer:
1


question:
Sentence: 'a young boy herds cattle with a stick in africa'. Find frequency of the letter 't'
answer:

4