public class Solution {
    public String swapCase(String text) {
        
        StringBuilder result = new StringBuilder();

        for (char c: text.toCharArray()){

            if (Character.isUpperCase(c)){
                result.append(Character.toLowerCase(c));
            }

            if (Character.isLowerCase(c)){
                result.append(Character.toUpperCase(c));
            }

            if (!Character.isLowerCase(c) && !Character.isUpperCase(c)){
                result.append(c);
            }

        }
        return result.toString();
    }
}