#include<cstdio>
#include<vector>
using namespace std;
vector <int> g[50010];
bool viz[50010];
int st[50010],k,m,n,x,y;
void dfs(int x){
    viz[x]=1;
    for(int i=0;i<g[x].size();++i){
        if(!viz[g[x][i]]) dfs(g[x][i]);
    }
    st[++k]=x;
}
int main()
{
    freopen("sortaret.in","r",stdin);
    freopen("sortaret.out","w",stdout);

    scanf("%d%d",&n,&m);
    for(int i=1;i<=n;++i){
        scanf("%d%d",&x,&y);
        g[x].push_back(y);
    }
    for(int i=1;i<=n;++i){
        if(!viz[i]){
            dfs(i);
        }
    }
    for(int i=n;i>=1;i--){
        printf("%d ",st[i]);
    }
}