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