#include <iostream>
#include <fstream>

using namespace std;

int n,m,b[100][100],gama[100],omega[100],v[100];

int main()
{
    ifstream f("date.in");
    f >> n >> m;
    int x,y;
    for(int j=1;j<=m;j++)
    {
        f >> x >> y;
        b[x][j]=1;
        b[y][j]=-1;
    }
    int k1=1,k2=1;
    for(int i=1;i<=n;i++)
    {
        //cout <<"gama- pentru nodul " << i << ": ";
        for(int j=1;j<=m;j++){
            if(b[i][j]==-1)
                for(int k=1;k<=n;k++)
                    if(b[k][j]==1)
                        omega[k2++]=k;
        }
        //cout << endl;
    }
    //cout << endl;
    for(int i=1;i<=n;i++)
    {
        //cout <<"omega+ pentru nodul " << i << ": ";
        for(int j=1;j<=m;j++){
            if(b[i][j]==1)
                for(int k=1;k<=n;k++)
                    if(b[k][j]==-1)
                        gama[k1++]=k;
        }
    }
    int k3=1;
    for(int i=1;i<k1;i++)
        for(int j=1;j<k2;j++)
        if(gama[i]==omega[j])
            {
                v[k3++]=gama[i];
                omega[i]=0;
                break;
            }
    return 0;
}
#include <iostream>
#include <fstream>

using namespace std;

int n,m,b[100][100],gama[100],omega[100],v[100];

int main()
{
    ifstream f("date.in");
    f >> n >> m;
    int x,y;
    for(int j=1;j<=m;j++)
    {
        f >> x >> y;
        b[x][j]=1;
        b[y][j]=-1;
    }
    int k1=1,k2=1;
    for(int i=1;i<=n;i++)
    {
        //cout <<"gama- pentru nodul " << i << ": ";
        for(int j=1;j<=m;j++){
            if(b[i][j]==-1)
                for(int k=1;k<=n;k++)
                    if(b[k][j]==1)
                        omega[k2++]=k;
        }
        //cout << endl;
    }
    //cout << endl;
    for(int i=1;i<=n;i++)
    {
        //cout <<"omega+ pentru nodul " << i << ": ";
        for(int j=1;j<=m;j++){
            if(b[i][j]==1)
                for(int k=1;k<=n;k++)
                    if(b[k][j]==-1)
                        gama[k1++]=k;
        }
    }
    int k3=1;
    for(int i=1;i<k1;i++)
        for(int j=1;j<k2;j++)
        if(gama[i]==omega[j])
            {
                v[k3++]=gama[i];
                omega[i]=0;
                break;
            }
    return 0;
}