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

Q: Sentence: 'a girl hitting a tennis ball on a court'. Find frequency of the letter 'l'

A: 3
****
Q: Sentence: 'a herd of giraffe walking across a field'. Find frequency of the letter 'k'

A: 1
****
Q: Sentence: 'a woman and a child walking down a sidewalk near a traffic sign'. Find frequency of the letter 'd'

A:
4
****