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

Sentence: 'a man on a surfboard riding on the waters waves'. Replace the letter 's' with 'k' in the sentence.
a man on a kurfboard riding on the waterk wavek

Sentence: 'a crowd watches as giraffes graze the tree tops at the zoo'. Replace the letter 't' with 'q' in the sentence.
a crowd waqches as giraffes graze qhe qree qops aq qhe zoo

Sentence: 'two men on a tennis court with tennis rackets'. Replace the letter 'e' with 'j' in the sentence.

two mjn on a tjnnis court with tjnnis rackjts