Write a program which converts uppercase/lowercase letters to lowercase/uppercase for a given string.

Constraints

* The length of the input string < 1200

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.

Example

Input

fAIR, LATER, OCCASIONALLY CLOUDY.


Output

Fair, later, occasionally cloudy.
#include <stdio.h>
#include <string.h>
#include <ctype.h>

int main(void)
{
  int len,i;
  char m;

  while((m=getchar())!=EOF){

    if(isupper(m)){
        printf("%c",tolower(m));
      }
    else {
        printf("%c",toupper(m));
      }
  }
      
  return 0;
}