#include <bits/stdc++.h>

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

const int NMax = 50005;
const int INF = 0x3f3f3f3f;

int n,m,x,y,top;
int viz[NMax],s[NMax];
vector<int> G[NMax];

void dfs(int nod){
    viz[nod] = 1;
    for(int i = 0; i < G[nod].size(); ++i){
        if(!viz[G[nod][i]]){
            dfs(G[nod][i]);
        }
    }
    s[++top] = nod;
}
int main()
{
    f >> n >> m;
    for(int i = 1; i <= m; ++i){
        f >> x >> y;
        G[x].push_back(y);
    }
    dfs(1);
    for(int i = top; i >= 1; --i){
        g << s[i] << ' ';
    }
    return 0;
}