#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

char*mmap();

#define RD(v) v=0;{int _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;}

long a[200001];
char wbuf[400002];

main(){
	int n;
	long x,y;
	char*rp=mmap(0l,1l<<28,1,2,0,0ll);
	RD(n);
	RD(x);
	RD(y);
	a[0]=x;
	for(int i=0;i<n;++i){
		long t;
		RD(t);
		a[i+1]=t;
	}
	long y0=y,y1=y;
	for(int i=n+1;i--;){
		long t=a[i];
		int s=(y1&~t?0:1)+(~y0&t?0:2);
		if(s==0) break;
		if(s&2) y1&=~t;
		if(s&1) y0|=~t;
		wbuf[i*2+0]=s+48;
		wbuf[i*2+1]=32;
	}
	if(wbuf[0]!=51) write(1,"-1",2);
	else write(1,wbuf+2,n*2);
	_exit(0);
}