#include <stdio.h>
#include <vector>
using namespace std;
vector<unsigned> graf[50001];
bool viz[50001];
long i,n,m,x,y;
FILE *f1,*f2;

void dfs(unsigned x)
{
    fprintf(f2,"%u ",x);
    viz[x]=true;
    for(unsigned i=0;i<graf[x].size();i++)
        if(viz[graf[x][i]]==false)
            dfs(graf[x][i]);
}
int main()
{
    f1=fopen("sortaret.in","r");
    f2=fopen("sortaret.out","w");
    fscanf(f1,"%ld%ld",&n,&m);
    for(i=0;i<m;i++)
    {
        fscanf(f1,"%ld%ld",&x,&y);
        graf[x].push_back(y);
    }
    dfs(1);
    return 0;
}