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

Ex Input:
Sentence: 'a teddy bear playing a drum and a teddy bear playing a guitar'. Replace the letter 'd' with 'm' in the sentence.

Ex Output:
a temmy bear playing a mrum anm a temmy bear playing a guitar

Ex Input:
Sentence: 'a tennis player wearing black shorts and blue shirt swinging at the ball'. Replace the letter 'w' with 'o' in the sentence.

Ex Output:
a tennis player oearing black shorts and blue shirt soinging at the ball

Ex Input:
Sentence: 'two people are standing under a polka dot umbrella'. Replace the letter 't' with 'c' in the sentence.

Ex Output:
cwo people are scanding under a polka doc umbrella