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>
using namespace std;
int main(){
    string str;
    getline(cin,str);
    for (char &i : str) {
        if (i>='a'&&i<='z')
            i=i+('A'-'a');
        else if (i>='A'&&i<='Z')
            i=i-('A'-'a');
    }
    cout<<str<<endl;
    return 0;
}