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>

int main()
{
	char ch;

	while ((ch = getchar()) != EOF)
	{
		if (ch >= 0x41 && ch <= 0x5A || ch >= 0x61 && ch <= 0x7A) ch ^= 0x20;
		printf("%c",ch);
	}

	return 0;
}