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

Q: Sentence: 'young girl playing with refrigerator magnet while kneeling on floor'. Find frequency of the letter 'n'

A: 6
****
Q: Sentence: 'a small boy in a high chair eating a cupcake'. Find frequency of the letter 'i'

A: 4
****
Q: Sentence: 'three zebras stand in a row near a rocky hill'. Find frequency of the letter 'o'

A:
2
****