Minimize Result by Adding Parentheses to Expression

Given a string expression in the form "<num1>+<num2>", where <num1> and <num2> are positive integers, you are tasked with adding a pair of parentheses to the expression. The goal is to ensure that after adding parentheses, the expression forms a valid mathematical expression and evaluates to the smallest possible value. The left parenthesis must be added to the left of '+' and the right parenthesis to the right of '+'. Print the modified expression.