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

Ex Input:
Sentence: 'a man in black shirt laying on bed with a teddy bear'. Replace the letter 'd' with 'b' in the sentence.

Ex Output:
a man in black shirt laying on beb with a tebby bear


Ex Input:
Sentence: 'a basket holds flowers, twigs, and various fruits'. Replace the letter 'a' with 'g' in the sentence.

Ex Output:
g bgsket holds flowers, twigs, gnd vgrious fruits


Ex Input:
Sentence: 'a black cat stands on the floor beside a cabinet'. Replace the letter 's' with 'u' in the sentence.

Ex Output:

a black cat utandu on the floor beuide a cabinet