#include <fstream>
#include <vector>
#include <bitset>
#define nmax 50000
using namespace std;
ifstream fin("sortaret.in");
ofstream fout("sortaret.out");
vector<int> sol,g[nmax+5];
int n,m;
bitset<nmax+5> viz;
void dfs(int nod)
{
    viz[nod]=1;
    for(int fiu : g[nod])
        if(!viz[fiu])
        dfs(fiu);
    sol.push_back(nod);
}
int main()
{
    fin>>n>>m;
    int x,y;
    for(int i=1;i<=n;i++)
    {
        fin>>x>>y;
        g[x].push_back(y);
    }
    for(int i=1;i<=n;i++)
        if(!viz[i])
        dfs(i);
    for(int i=sol.size()-1;i>=0;i--)
        fout<<sol[i]<<" ";
    return 0;
}