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

Sentence: 'three young school girls waiting on a subway train platform'. Replace the letter 't' with 'o' in the sentence.
ohree young school girls waioing on a subway orain plaoform

Sentence: 'three colorful knit bear toys with button eyes'. Replace the letter 'r' with 'z' in the sentence.
thzee colozful knit beaz toys with button eyes

Sentence: 'a small boy with a skateboard in the house'. Replace the letter 'o' with 'i' in the sentence.

a small biy with a skatebiard in the hiuse