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

#ifdef _WIN32
#include <Windows.h>
#else
#include <unistd.h>
#endif

int main()
{
    char userInput[15];
    char *encryptedKey;
    char doubleuserInput[30], firstarray[30], secondarray[30];
    int i, iswrong;
    int delaytime;
    void delay(unsigned int);

    encryptedKey = "OHDSVXHIVAEBMRMXDPAAEIXTFQJZYB";

    delaytime = 1000;

    fgets(userInput, 16, stdin);

#ifdef _WIN32
Sleep(delaytime);
#else
usleep(delaytime * 1000);
#endif


    for(i = 0; i < sizeof(doubleuserInput); i++)
    {
        doubleuserInput[i] = userInput[i%sizeof(userInput)];
    }

    for(i = 0; i < sizeof(userInput); i++)
    {
        firstarray[2*i] = ((userInput[i] - 65 + 12)%26) + 65;
        firstarray[2*i + 1] = ((userInput[i] - 65 + 15)%26) + 65;
    }

    printf("\n");
    for(i=0; i < sizeof(firstarray); i++)
    {
        secondarray[i] = (((firstarray[i] - 65) + (doubleuserInput[i] - 65)) % 26) + 65;
    }

    for(i = 0; i < sizeof(secondarray); i++)
    {
        printf("%c", secondarray[i]);
    }

    iswrong = 0;
    for(i = 0; i < sizeof(secondarray); i++)
    {
        if(!(secondarray[i] == *(encryptedKey + i)))
        {
            iswrong = 1;
        }
    }

    if(iswrong == 1)
        printf("Nop, dat is m niet");
    if(iswrong == 0)
        printf("Proof is in the key");

    return 0;
}