#include?
#include?
#include?
#include?
#include?
#include?
using?namespace?std;

//Global?Variables?&?Definitions
#define?MAXN?1010
#define?MAXM?1010

#define?MS（arr?x）?memset（arr?x?sizeof（arr））

int?N?M;
//End?Global?Variables?&?Definitions

//Map
struct?edge?{
	int?v?next;
}?e[MAXM];

int?h[MAXN];
int?ecnt;

int?in[MAXN];

inline?void?init_edge（）?{
	MS（h?ecnt?=?-1）;
	//MS（in?0）;
}

inline?void?adde（int?u?int?v）?{
	++in[v];
	
	++ecnt;
	e[ecnt].v?=?v;
	e[ecnt].next?=?h[u];
	h[u]?=?ecnt;
}

priority_queue?greater?>?q;
//End?Map

//Main?Structure
int?ans[MAXN];

inline?void?ir（）?{
	freopen（“correct.in“?“r“?stdin）;
	freopen（“correct.out“?“w“?stdout）;
	
	scanf（“%d%d“?&N?&M）;
	
	int?u?v;
	init_edge（）;
	for?（int?i?=?0;?i?		scanf（“%d%d“?&u?&v）;
		adde（u?v）;
	}
	
	for?（int?i?=?1;?i?<=?N;?++i）?if?（!in[i]）?q.push（i）;
}

int?main（）?{
	ir（）;
	
	int?cnt?=?0;
	while?（!q.empty（））?{
		int?u?=?q.top（）;?q.pop（）;
		ans[cnt++]?=?u;
		
		for?（int?i?=?h[u];?~i;?i?=?e[i].next）?{
			int?v?=?e[i].v;
			if?（!（--in[v]））?q.push（v）;
		}
	}
	
	if?（cnt?!=?N）?return?2;
	for?（int?i?=?0;?i?	putchar（‘\n‘）;
	
	return?0;
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2016-07-22?19:27??day2\
?????文件???????????0??2016-07-22?18:32??day2\.cena
?????目錄???????????0??2016-07-22?18:32??day2\data\
?????目錄???????????0??2016-07-22?18:32??day2\data\correct\
?????文件????????1341??2016-07-22?18:32??day2\data\correct\correct.cpp
?????文件?????2089632??2016-07-22?18:32??day2\data\correct\correct.exe
?????文件?????????349??2016-07-22?18:32??day2\data\correct\correct1.in
?????文件?????????142??2016-07-22?18:32??day2\data\correct\correct1.out
?????文件????????4301??2016-07-22?18:32??day2\data\correct\correct10.in
?????文件????????1893??2016-07-22?18:32??day2\data\correct\correct10.out
?????文件????????4760??2016-07-22?18:32??day2\data\correct\correct11.in
?????文件????????2093??2016-07-22?18:32??day2\data\correct\correct11.out
?????文件????????5174??2016-07-22?18:32??day2\data\correct\correct12.in
?????文件????????2293??2016-07-22?18:32??day2\data\correct\correct12.out
?????文件????????5653??2016-07-22?18:32??day2\data\correct\correct13.in
?????文件????????2493??2016-07-22?18:32??day2\data\correct\correct13.out
?????文件????????6082??2016-07-22?18:32??day2\data\correct\correct14.in
?????文件????????2693??2016-07-22?18:32??day2\data\correct\correct14.out
?????文件????????6556??2016-07-22?18:32??day2\data\correct\correct15.in
?????文件????????2893??2016-07-22?18:32??day2\data\correct\correct15.out
?????文件????????7012??2016-07-22?18:32??day2\data\correct\correct16.in
?????文件????????3093??2016-07-22?18:32??day2\data\correct\correct16.out
?????文件????????7437??2016-07-22?18:32??day2\data\correct\correct17.in
?????文件????????3293??2016-07-22?18:32??day2\data\correct\correct17.out
?????文件????????7886??2016-07-22?18:32??day2\data\correct\correct18.in
?????文件????????3493??2016-07-22?18:32??day2\data\correct\correct18.out
?????文件????????8342??2016-07-22?18:32??day2\data\correct\correct19.in
?????文件????????3693??2016-07-22?18:32??day2\data\correct\correct19.out
?????文件?????????697??2016-07-22?18:32??day2\data\correct\correct2.in
?????文件?????????293??2016-07-22?18:32??day2\data\correct\correct2.out
?????文件????????8792??2016-07-22?18:32??day2\data\correct\correct20.in
............此處省略93個文件信息