In this task, you need to count the number of times the given letter appears in the given sentence.

Q: Sentence: 'an old woman is holding her cat in front of a camera'. Find frequency of the letter 'r'

A: 3
****
Q: Sentence: 'two elephants walking on cement next to wall'. Find frequency of the letter 'n'

A: 5
****
Q: Sentence: 'a clock on a building in between two buildings'. Find frequency of the letter 'n'

A:
5
****