Problem:
Toggling Cases

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

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.

Constraints

The length of the input string < 1200

Sample Input

fAIR, LATER, OCCASIONALLY CLOUDY.

Sample Output

Fair, later, occasionally cloudy.

Solution in C (judge verdict: Time Limit Exceeded)

#include <stdio.h>
#include <ctype.h>

int i, j, k;
char string[100];

int main(void) {
	i = 0;
	scanf("%s", string);
	while (string[i] != 0x00) {
		if (string[i] >= 'a' && string[i] <= 'z') {
			putchar(toupper(string[i]));
		} else {
			putchar(tolower(string[i]));
		}
	}
	putchar('\n');
}