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<ctype.h>
int main(){
  int n,i;
  char c;
  while((c=getchar())!=EOF){
    if(islower(c))c=toupper(c);
    else c=tolower(c);
    printf("%c",c);
  }
  return 0;
}