In this task, you need to replace a letter in the sentence with another given letter.

Input: Consider Input: Sentence: 'a couple of horses with carriages at a building'. Replace the letter 'u' with 'm' in the sentence.

Output: a comple of horses with carriages at a bmilding


Input: Consider Input: Sentence: 'a ping pong player is in a ready stance to return the ball'. Replace the letter 'n' with 'e' in the sentence.

Output: a pieg poeg player is ie a ready staece to reture the ball


Input: Consider Input: Sentence: 'there are sheep grazing on a rocky field'. Replace the letter 'i' with 'u' in the sentence.


Output: there are sheep grazung on a rocky fueld