#include <iostream>
#include <fstream>
using namespace std;

ifstream f("sortaret.in");
ofstream g("sortaret.out");

#define NMax 23170
int N,A[NMax][NMax];
int M;
void citire()
{
    f>>N>>M;
    short int x,y;
    for(int i=1;i<=N;i++)
        for(int j=1;j<=N;j++)
            A[i][j]=0;
    for(int i=1;i<=M;i++)
    {
        f>>x>>y;
        A[x][y]=1;
    }
    f.close();
}
void parcurgere()
{
    int C[NMax],V[NMax];
    for(int i=1;i<=N;i++)
        V[i]=0;
    V[1]=1;
    C[1]=1;
    short int p=1,u=1;
    while(p<=u)
    {
        for(int i=1;i<=N;i++)
            if(A[C[p]][i]==1 && V[i]==0)
            {
                u++;
                C[u]=i;
                V[i]=1;
            }
        p++;
    }
    for(int i=1;i<=u;i++)
        g<<C[i]<<" ";
    g.close();
}
int main()
{
    citire();
    parcurgere();
    return 0;
}