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

Sentence: 'a couple of giraffe standing next to each other'. Replace the letter 'i' with 'q' in the sentence.
a couple of gqraffe standqng next to each other

Sentence: 'a man extends his arm with a frisbee in hand as another reaches to grab it while teammates watch'. Replace the letter 'a' with 'g' in the sentence.
g mgn extends his grm with g frisbee in hgnd gs gnother regches to grgb it while tegmmgtes wgtch

Sentence: 'a group of people boarding and exiting a train'. Replace the letter 'e' with 'w' in the sentence.

a group of pwoplw boarding and wxiting a train