TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a man is on a saddled horse with reins'. Replace the letter 's' with 'o' in the sentence.

SOLUTION: a man io on a oaddled horoe with reino

PROBLEM: Sentence: 'a buddha statue sitting under a cat umbrella'. Replace the letter 'c' with 'h' in the sentence.

SOLUTION: a buddha statue sitting under a hat umbrella

PROBLEM: Sentence: 'a back pack and lap top sit on the kitchen counter'. Replace the letter 't' with 'k' in the sentence.

SOLUTION:
a back pack and lap kop sik on khe kikchen counker