In this task, you need to count the number of times the given letter appears in the given sentence.
--------
Question: Sentence: 'a snowboarder making a jump of a snowy ledge'. Find frequency of the letter 'o'

Answer: 4


Question: Sentence: 'a girl playing with a frisbee while people watch'. Find frequency of the letter 'e'

Answer: 5


Question: Sentence: 'a man flying through the air while riding skis'. Find frequency of the letter 'o'

Answer:
1