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>
int main(){
  char n[1200];
  int i,num;
  while(1){
    scanf("%s",n);
    num=strlen(n);
    for(i=0;i<num;i++){
      if(n[i]>64 && n[i]<91)n[i]+=32;
      else if(n[i]>96 && n[i]<123)n[i]-=32;
    }
    printf("%s\n",n);
  }
  return(0);
}