a sentence string singlespace separate word word consist lowercase lettersA word uncommon appear exactly sentence appear sentenceGiven sentence s1 s2 return list uncommon word you return answer order Example 1input s1 apple sweet s2 apple souroutput sweetsourExample 2input s1 apple apple s2 bananaoutput banana Constraints1 s1length s2length 200s1 s2 consist lowercase English letter spacess1 s2 lead trail spacesall word s1 s2 separate single space