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>
#include<ctype.h>

int main(){
  char ch;
  scanf("%c",&ch);
  while(!("\n"==ch)){
    if(islower(ch)){
      printf("%c",toupper(ch));}
    else printf("%c",tolower(ch));
    scanf("%c",&ch);
    }
  printf("\n");
  return 0;}