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 main()
{
	char ch;

	while (1){
		scanf(" %c", &ch);

		if (ch == '\n') break;

		if (islower(ch) != 0) printf("%c", toupper(ch));
		else                  printf("%c", tolower(ch));

	}

	printf("\n");

	return 0;
}