TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a red stop signed has been altered to say stop hate'. Replace the letter 'e' with 't' in the sentence.

SOLUTION: a rtd stop signtd has bttn alttrtd to say stop hatt

PROBLEM: Sentence: 'a person on a surfboard riding in ocean waves'. Replace the letter 's' with 'g' in the sentence.

SOLUTION: a pergon on a gurfboard riding in ocean waveg

PROBLEM: Sentence: 'a brown bear is digging in the ground for something'. Replace the letter 'i' with 'h' in the sentence.

SOLUTION:
a brown bear hs dhgghng hn the ground for somethhng