import java.io.*;

public class Input {
    private int n, m;
    private BufferedReader reader;
    private int[] arr;
    private int count;

    public Input() {
        count = 0;
        try{
            reader = new BufferedReader(new FileReader("input.txt"));

            String s = reader.readLine();
            String[] ss = s.split(" ");
            n = Integer.parseInt(ss[0]);
            m = Integer.parseInt(ss[1]);
            arr = new int[2*m];
                
            s = reader.readLine();
            ss = s.split(" ");
            for (int i=0; i<2*m; i++) arr[i] = Integer.parseInt(ss[i]); 
        }
        catch(FileNotFoundException fnfe){
            fnfe.printStackTrace();
        }
        catch(IOException ioe) {
            ioe.printStackTrace();
        }
    }
    public int getN() {
        return n;
    }
    public int getM() {
        return m;
    }
    public int getInt() {
        int x = -1;
        if (count < 2*m) {
            x = arr[count];
            count++;
        }
        return x;
    }
}

/* An example for the input.txt file:
7 8
0 2 1 4 2 5 1 6 1 6 0 4 6 0 4 5
*/