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