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

Input: Consider Input: Sentence: 'a bathroom that has  a sink and a toilet'. Replace the letter 's' with 'a' in the sentence.

Output: a bathroom that haa  a aink and a toilet


Input: Consider Input: Sentence: 'a city street at dusk time with traffic'. Replace the letter 'i' with 'm' in the sentence.

Output: a cmty street at dusk tmme wmth traffmc


Input: Consider Input: Sentence: 'several vehicles are moving along a city street'. Replace the letter 'a' with 'o' in the sentence.


Output: severol vehicles ore moving olong o city street