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

Q: Sentence: 'a red fire hydrant opened and spilling water'. Find frequency of the letter 'd'

A: 4
****
Q: Sentence: 'a young elephant is touching a bigger elephant with its trunk'. Find frequency of the letter 'i'

A: 5
****
Q: Sentence: 'a woman in a pink shirt smiling and leaning against an appliance'. Find frequency of the letter 'n'

A:
10
****