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

Sentence: 'a yellow fire truck parked in a parking lot'. Replace the letter 'a' with 'y' in the sentence.
y yellow fire truck pyrked in y pyrking lot

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: 'the tall, adult giraffe stands behind a fence near a wooden pole'. Replace the letter 'a' with 's' in the sentence.

the tsll, sdult girsffe stsnds behind s fence nesr s wooden pole