#include<stdio.h>
#include<ctype.h>
int main (){
char str[10001];
fgets(str,10001,stdin);
for(int i=0;str[i]!='\0';i++){
char c = str[i];
if(!(isalpha(c)||c==''))
{
printf("Invalid Input");
return 0;
}
if(isupper(c))
str[i]='Z'-(c-'A');
else if(islower(c))
str[i]='z'-(c-'a');
}
printf("%s",str);
return 0;
}