#pragma GCC optimize("Ofast")

#define rd() ({long _v=0,_c;while(_c=*rp++-48,_c>=0)_v=_v*10+_c;_v;})
#define wt(v) {ulong _z=v;do*--wp=_z%10+48;while(_z/=10);}
#define rrep3(v,s,e) for(long v=e;--v>=s;)

typedef unsigned long ulong;
char wbuf[1<<25];

int main(){
	long n,s;
	{
		char rbuf[64];
		read(0,rbuf,sizeof rbuf);
		char*rp=rbuf;
		n=rd();
		s=rd();
	}
	long k=0;
	char*wp=wbuf+sizeof wbuf;
	rrep3(i,1,n+1){
		if(s>=i){
			s-=i;
			*--wp=' ';
			wt(i);
			++k;
		}
	}
	*--wp='\n';
	wt(k);
	write(1,wp,wbuf+sizeof wbuf-wp);
	_exit(0);
}