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

    int main(int argc, char **argv) {

            FILE* input  = fopen(argv[1], "rb");

            char k[] = "VeryLongKeyYouWillNeverGuess";
            char raw[416];
            char c, p, t = 0;
            int i = 0,b=0;
            while(i!=415){
                    raw[i]=(char)fgetc(input);
                    //printf("%c",raw[i]);
                    i++;
            }

            i=0;
            while(i!=415){
                    for(b=1;b<128;b++){
                            c = (b + (k[i % strlen(k)] ^ t) + i*i) & 0xff;
                            if(c==raw[i]){
                                    printf("%c",b);
                                    break;
                            }
                    }
                    t = b;
                    i++;
            }
            return 0;
    }