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

Sentence: 'nine geese flying south for the winter months'. Replace the letter 't' with 'f' in the sentence.
nine geese flying soufh for fhe winfer monfhs

Sentence: 'a man dressed in a knight costume riding a horse performing at a show'. Replace the letter 'e' with 'j' in the sentence.
a man drjssjd in a knight costumj riding a horsj pjrforming at a show

Sentence: 'a train engine parked at a station as passengers board it'. Replace the letter 'a' with 'y' in the sentence.

y tryin engine pyrked yt y stytion ys pyssengers boyrd it