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 <cctype>

int main() {
	char ch = getchar();
	while(ch != EOF) {
		if(isalpha(ch)) {
			if(islower(ch)) ch = toupper(ch);
			else ch = tolower(ch);
		}
		putchar(ch);
		ch = getchar();
	}
	return 0;
}
