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 ch;
    while(1){
        scanf("%c",&ch);
        if(isalpha(ch)){
            if(islower(ch))printf("%c",toupper(ch));
            else printf("%c",tolower(ch));
        }
        else printf("%c",ch);
        if(ch=='/n')break;
    }
    return 0;
}