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#include <iostream>
#include <stdio.h>
#include <vector>
using namespace std;
vector <int> sol;
vector <int> g[50010];
int n,m;
void citire()
{
scanf("%d %d",&n,&m);
for(int i=0;i<m;i++)
{
int a,b;
scanf("%d %d",&a,&b);
g[a].push_back(b);
}
}
int viz[50010];
void dfs(int k)
{
for(int i=0;i<g[k].size();i++)
if(!viz[g[k][i]])
{
viz[g[k][i]]=1;
dfs(g[k][i]);
}
sol.push_back(k);
}
void afisare()
{
for(int i=sol.size()-1;i>=0;i--)
cout<<sol[i]<<" ";
}
int main()
{
freopen("sortaret.in","r",stdin);
citire();
viz[1]=1;
dfs(1);
afisare();
return 0;
}