#include <iostream>
#include <string>
 
using namespace std;
 
const int ALPHABET_SIZE = 'Z' - 'A' + 1;
const int CEZAR_SHIFT = 3;
 
// dziala tylko dla DUZYCH liter
char cezar_encode(char znak)
{
    return 'A' + ((znak - 'A' + CEZAR_SHIFT) % ALPHABET_SIZE);
}
 
char cezar_decode(char znak)
{
    return 'A' + ((ALPHABET_SIZE + znak - 'A' - CEZAR_SHIFT) % ALPHABET_SIZE);
}
 
int main()
{ 
 
    string tekst;
    int dlugosc,i;
 
    tekst = "ATOJESTTESTZ";
 
    dlugosc=tekst.length();
 
    for(i=0;i<dlugosc;i++)
    {
      tekst[i] = cezar_encode(tekst[i]);
    }
 
    cout << "Zakodowane: " << tekst << endl;
 
    for(i=0;i<dlugosc;i++)
    {
      tekst[i] = cezar_decode(tekst[i]);
    }
 
    cout << "Odkodowane: " << tekst << endl;
 
    return 0;
}
 

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