#include<stdio.h>
#include<ctype.h>
#include<string.h>
int main(){
    char s[1001];
    fgets(s,sizeof(s),stdin);
    s[strcspn(s,"\n")] = 0;
    for(int i =0;s[i]!='\0';i++){
        if(!(isalpha(s[i]) || s[i]== '')){
            printf("Invalid Input");
            return 0;
        }
    }
    for(int i =0;s[i]!='\0';i++){
        if(s[i]>='a'&& s[i]<='z'){
            s[i]='z'-(s[i]-'a');
        }
        else if(s[i]-'A' && s[i]<='Z'){
            s[i] = 'Z'-('A');
        }
    }
    printf("%s",s);
    return 0;
}