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

Ex Input:
Sentence: 'a white bathroom with a stand alone sink and a shower curtain'. Replace the letter 'a' with 'm' in the sentence.

Ex Output:
m white bmthroom with m stmnd mlone sink mnd m shower curtmin

Ex Input:
Sentence: 'commuter trains on tracks next to paved platform'. Replace the letter 'm' with 'w' in the sentence.

Ex Output:
cowwuter trains on tracks next to paved platforw

Ex Input:
Sentence: 'a stop sign that has a sign below it clarifying there is no stopping between certain times'. Replace the letter 't' with 'f' in the sentence.

Ex Output:
a sfop sign fhaf has a sign below if clarifying fhere is no sfopping befween cerfain fimes