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(void)
{

    char moji;
    
    while(1)
    {
        scanf("%c",&moji);
        if(moji=='.'){printf("%c",moji); break;}
        else
        {
            if(moji>='a' && moji<='z')
            {
                printf("%c",toupper(moji));
            }
            else if(moji>='A' && moji<='Z')
            {
                printf("%c",tolower(moji));
            }
            else printf("%c",moji);
        }
    }
    printf("\n");
    
    return 0;
}