Write a program which converts uppercase/lowercase letters to lowercase/uppercase for a given string.

Constraints

* The length of the input string < 1200

Input

A string is given in a line.

Output

Print the converted string in a line. Note that you do not need to convert any characters other than alphabetical letters.

Example

Input

fAIR, LATER, OCCASIONALLY CLOUDY.


Output

Fair, later, occasionally cloudy.
#include <cstdio>
#include <string>

using namespace std;

int main() {
    char buf[1<<11];
    fgets(buf, 1<<11, stdin);
    string s(buf);

    for (char c: s)
        printf("%c", (c>='A'&&c<='Z')||(c>='a'&&c<='z')? c^0x20:c);

    return 0;
}