#include <stdlib.h>
#include <stdio.h>
typedef long unsigned int ui;
ui ww(ui);
ui ru(){return (ui)arc4random()<<32 | arc4random();}

int main(){printf("%016lx\n", ww(0x0102040810204080));
  for(int j=0; j<10000000; ++j) {ui a = ru(), b = ru();
    if(1) if(ww(a^b)^ww(a)^ww(b)) exit(printf("ww"));}  return 0;}