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

Sentence: 'a brown door  that says gentlemen and a toilet'. Replace the letter 'o' with 'f' in the sentence.
a brfwn dffr  that says gentlemen and a tfilet

Sentence: 'traffic congestion with cars and an electric tram'. Replace the letter 'a' with 'k' in the sentence.
trkffic congestion with ckrs knd kn electric trkm

Sentence: 'a man is getting on to his motorcysle'. Replace the letter 't' with 'd' in the sentence.

a man is gedding on do his modorcysle