TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'many street signs in front of a building while it is snowing'. Replace the letter 'r' with 'x' in the sentence.

SOLUTION: many stxeet signs in fxont of a building while it is snowing

PROBLEM: Sentence: 'a woman is on skis riding down the snow covered sloped'. Replace the letter 'd' with 'q' in the sentence.

SOLUTION: a woman is on skis riqing qown the snow covereq slopeq

PROBLEM: Sentence: 'a lone yellow dire hydrant sitting at the curb'. Replace the letter 'g' with 'h' in the sentence.

SOLUTION:
a lone yellow dire hydrant sittinh at the curb