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 <cstdio>
#include <cctype>

int main(){
	char A;

	while(1){
		scanf("%c",&A);
		char S;		
		if(isalpha(A)){
			if(islower(A))S=toupper(A);
			else S=tolower(A);
			printf("%c",S);
		}
        else printf("%c",A);

		if(A == '.')break;           
	}

	printf("\n");

	return 0;
}