#include<stdio.h>
#include<string>
using namespace std;
char invert (char c){
    if (c>='a'&&c<='z')return'z'-(c-'a');
    if(c>='A'&&C<='Z')return'Z'-(c-'A');
    return c;
}
int main(){
    string s;
    getline(cin,s);
    for (char c:s){
        if(!(c==''|| isalph(c))){
            cout<<"invalid input";
            return 0;
            
        }
    }
    for(char &c:s)
    if(c!='')c=invert(c);
    cout<<s;
}