class Solution {
public String solution(String my_string) {
String answer = "";
for (int i = 0; i < my_string.length(); i++) {
if (Character.isLowerCase(my_string.charAt(i))) {
answer += Character.toUpperCase(my_string.charAt(i));
} else {
answer += Character.toLowerCase(my_string.charAt(i));
}
}
return answer;
}
}