you give 0indexed string expression form num1num2 num1 num2 represent positive integersAdd pair parenthese expression addition parenthese expression valid mathematical expression evaluate small possible value the left parenthesis add leave right parenthesis add right return expression add pair parenthese expression evaluate small possible value if multiple answer yield result return themthe input generate original value expression value expression add pair parenthesis meet requirement fit sign 32bit integer Example 1input expression 24738output 24738explanation the expression evaluate 2 47 38 2 85 170note 24738 invalid right parenthesis right it show 170 small possible valueexample 2input expression 1234output 1234explanation the expression evaluate 1 2 3 4 1 5 4 20example 3input expression 999999output 999999explanation the expression evaluate 999 999 1998 Constraints3 expressionlength 10expression consist digit 1 9 expression start end digitsexpression contain exactly the original value expression value expression add pair parenthesis meet requirement fit sign 32bit integer