TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a clock mounted above a door entrance with windows'. Replace the letter 's' with 'l' in the sentence.

SOLUTION: a clock mounted above a door entrance with windowl

PROBLEM: Sentence: 'a gray elephant standing next to green bushes'. Replace the letter 'e' with 'o' in the sentence.

SOLUTION: a gray olophant standing noxt to groon bushos

PROBLEM: Sentence: 'a batter on the batting mark and a catcher behind him at he plate'. Replace the letter 'a' with 'x' in the sentence.

SOLUTION:
x bxtter on the bxtting mxrk xnd x cxtcher behind him xt he plxte