TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a crowd looking at a trio of planes that are sitting idle'. Replace the letter 'a' with 'e' in the sentence.

SOLUTION: e crowd looking et e trio of plenes thet ere sitting idle

PROBLEM: Sentence: 'a crowd watches as giraffes graze the tree tops at the zoo'. Replace the letter 't' with 'q' in the sentence.

SOLUTION: a crowd waqches as giraffes graze qhe qree qops aq qhe zoo

PROBLEM: Sentence: 'the stuffed bear has a fishing pole with a toy fish on it'. Replace the letter 'n' with 's' in the sentence.

SOLUTION:
the stuffed bear has a fishisg pole with a toy fish os it