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

Sentence: 'a woman sitting on a bench under a gazebo'. Replace the letter 's' with 'u' in the sentence.
a woman uitting on a bench under a gazebo

Sentence: 'a family opens gifts in a room with their dog, while sitting on couches'. Replace the letter 's' with 'l' in the sentence.
a family openl giftl in a room with their dog, while litting on couchel

Sentence: 'a charcoal and chrome bike sits in the horizon'. Replace the letter 'h' with 'o' in the sentence.

a coarcoal and corome bike sits in toe oorizon