class AdjacencyLists {
    static class Node {
	int v; Node next;
	Node (int v, Node t) { this.v = v; this.next = t; }
    }

    public static void main (String [] args) {
	int V = Integer.parseInt (args[0]);
	int E = Integer.parseInt (args[1]);
	Node adj[] = new Node[V];
	for (int i = 0; i < V; i++) adj[i] = null;
	for (In.init (); !In.empty (); /* none */) {
	    int i = In.getInt ();
	    int j = In.getInt ();
	    adj[i] = new Node (j, adj[i]);
	    adj[j] = new Node (i, adj[j]);
	    Out.println ("There is an edge between " + i + " and " + j + ".");
	}
    }
}