TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a girl sitting in a chair eating a slice of pizza'. Replace the letter 'i' with 'x' in the sentence.

SOLUTION: a gxrl sxttxng xn a chaxr eatxng a slxce of pxzza

PROBLEM: Sentence: 'a table that has a pizza sitting on it'. Replace the letter 'a' with 'w' in the sentence.

SOLUTION: w twble thwt hws w pizzw sitting on it

PROBLEM: Sentence: 'vehicle traffic in city area on cloudy day'. Replace the letter 'c' with 's' in the sentence.

SOLUTION:
vehisle traffis in sity area on sloudy day