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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("sortaret.in");
ofstream g("sortaret.out");
int n,m,a[101][101],viz[1001];
void citire()
{
f>>n>>m;
for(int i=1;i<=m;i++)
{
int x,y;
f>>x>>y;
a[x][y]=1;
}
}
void df(int k)
{
viz[k]=1;
for(int i=1;i<=n;i++)
if(a[k][i] && !viz[i])
{
g<<i<<" ";df(i);
}
}
int main()
{citire();
g<<1<<" ";
for(int i=1;i<=n;i++)
{
if(!viz[i]) df(i);
}
return 0;
}