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

Sentence: 'some tracks for a rail way system near a building'. Replace the letter 'a' with 'h' in the sentence.
some trhcks for h rhil why system nehr h building

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 white and black horse standing on a lush green hillside'. Replace the letter 'a' with 'q' in the sentence.

q white qnd blqck horse stqnding on q lush green hillside