instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a view from a bathroom shows an open door'. Find frequency of the letter 'o'
answer:
7


question:
Sentence: 'a group of people walking down a rain soaked street with umbrellas'. Find frequency of the letter 'w'
answer:
3


question:
Sentence: 'two people holding wii remotes and standing in front of a tv'. Find frequency of the letter 'n'
answer:

6