#include <stdio.h>
#include <ctype.h>
int main(void){

  int i,k;
  char password[100];
  char PASSWORD[100]={};

  scanf("%s",password);

  for(i=0;password[i]!='\0';i++){
    k=islower(password[i]);
    if(k!=0){
      PASSWORD[i]=toupper(password[i]);
    }
    else{
      PASSWORD[i]=tolower(password[i]);
    }
  }

  printf("%s\n",PASSWORD);

return 0;
}