#include <stdio.h>
#include <string.h>

#define BUFSIZE 5120
#define MAX_KEYLEN ( BUFSIZE / 100 )

const unsigned int num_letters = 'Z' - 'A' + 1;

void encrypt(char* text, const char* key) {
    const char* c = key;
    while(*text) {
        // encrpypt
        *text = 'A' + ((*text - 'A') + (*c - 'A')) % num_letters ;
        
        // increase pointers
        ++c;
        if (*c == '\0') {
            c = key; // reset c at end of keyword
        }
        ++text;
    }
}

void decrypt(char* text, const char* key) {
    const char* c = key;
    while(*text) {
        // encrpypt
        int shift = (*text - 'A') - (*c - 'A');
        if (shift < 0) shift += num_letters;
        *text = 'A' + shift ;
        
        // increase pointers
        ++c;
        if (*c == '\0') {
            c = key; // reset c at end of keyword
        }
        ++text;
    }
}

int main() {
    // read key
    char key[MAX_KEYLEN+1];
    scanf("%s", key);
    
    char text[BUFSIZE + 1];
    unsigned int len = 0;
    char c;
    // fill text-buffer
    while (len < BUFSIZE && (c = getchar()) != EOF) {
        if (c >= 'A' && c <= 'Z') {
            text[len++] = c; 
        }
    }
    // terminate string with nullbyte
    text[len] = '\0'; 
    
    encrypt(text,key);
    printf ("Geheimtext: %s\n\n", text);
    
    decrypt(text, key);
    printf("Wieder entschluesselt: %s\n", text);
}