// editor3
#include<stdio.h>
#include<ctype.h>
#include<string.h>
int main(){
    char message[10005];
    fgets(message, sizeof(message),stdin);
    int n=strlen(message);
    if(message[n-1]=='\n'){
        message[n-1]='\0';
        n--;
    }
    for(int i=0;i<n;i++){
        if(!(isalpha(message[i]) || message[i]== '')){
            printf("Invalid input");
            return 0;
        }
    }
    for(int i=0;i<n;i++){
        if(islower(message[i])){
            message[i]= 'a' +('z'-message[i]);
            }else if (isupper(message[i])){
                message[i]='A'+('Z'-message[i]);
            }
    }
    printf("%s",message);
    return 0;
}