#include <iostream>
#include <cstring>

using namespace std;

const int N = 1e5 + 100;
int ne[N],e[N],idx;
int h[N];
int d[N];
int n,m;
int q[N];

void add(int a,int b){
    e[idx] = b;
    ne[idx] = h[a];
    h[a] = idx ++;
}

bool ss(){
    int hh = 1,zz = 0;
    for(int i = 1; i <= n; i ++){
        if(d[i] == 0) q[++ zz] = i;
    }
    while(hh <= zz){
        int z = q[hh ++];
        for(int i = h[z]; i != -1; i = ne[i]){
            int j = e[i];
            if(--d[j] == 0) q[++ zz] = j;
        }
    }
    return zz == n;
}

int main(){
    cin >> n >> m;
    memset(h,-1,sizeof h);
    for(int i = 1; i <= m; i ++){
        int a,b;
        cin >> a >> b;
        add(a,b);
        d[b] ++;
    }

    if(ss()){
        for(int i = 1; i <= n; i ++) cout << q[i] << " ";
        cout << endl;
    }
    else cout << -1 << endl;
    return 0;
}