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<iostream>
#include<cctype>

using namespace std;

int main() {
	char ch;
	while (1){
		cin >> ch;
		if (ch == '\n') break;
		if (islower(ch)) cout << (char)toupper(ch);
		else if (isupper(ch)) cout << (char)tolower(ch);
		else cout << ch;
	}
}