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

Input: Consider Input: Sentence: 'a group of small children sitting at a table in front of a pizza'. Replace the letter 'r' with 'd' in the sentence.

Output: a gdoup of small childden sitting at a table in fdont of a pizza


Input: Consider Input: Sentence: 'a white plate topped with meat and greens'. Replace the letter 's' with 'b' in the sentence.

Output: a white plate topped with meat and greenb


Input: Consider Input: Sentence: 'a train engineer preparing the engine of this train for travel'. Replace the letter 'p' with 'u' in the sentence.


Output: a train engineer ureuaring the engine of this train for travel