Amai Mask loves playing with strings. No wonder, he has got another problem this time. He is given a string \(S\) consisting of lower case and upper case English alphabets, special characters and numbers. He just needs to change the cases of each character. That is, all lower case alphabets should be changed to upper case and vice-versa. Special characters and numbers will remain as such.

Since he's in a hurry for his concert and isn't a programmer by any chance, he asks you to help him by writing a code for this purpose.

Input

The first contains \(n\) - length of string

Second line of input contains string \(S\).

Output

Output the resultant string in a single line.

Constraints

\(1 \le |S| \le 1000\) , where \(|S|\) is the length of string.