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

Sentence: 'a man that is on his cell phone'. Find frequency of the letter 's'
2

Sentence: 'a baseball themed birthday cake is on a serving tray'. Find frequency of the letter 'g'
1

Sentence: 'there are bananas in the blender in the kitchen'. Find frequency of the letter 't'

4