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

Sentence: 'a metallic stove top oven inside of a wooden kitchen'. Find frequency of the letter 'v'
2

Sentence: 'a downhill skier with snow plumes behind them'. Find frequency of the letter 'i'
4

Sentence: 'there are three skiers on top of a mountain together'. Find frequency of the letter 'e'

8