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>

int main()
{

	int ch;

	for(;;){
		
		ch = getchar();		

		if(islower(ch)){
			ch = tolower(ch);
		} else if( islower(ch) ){
			ch = toupper(ch);
		}

		putchar(ch);
	}
	return 0;
}