import java.util.*;

public class Solution {

public static void main(String[] args) {

/* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */

Scanner in = new Scanner(System.in);

int n = in.nextInt();

int m = in.nextInt();

int[][] edges = new int[m][2];

for (int i = 0; i < m; i++) {

for (int j = 0; j < 2; j++) {

edges[i][j] = in.nextInt();

}

}

//System.out.println(Arrays.deepToString(edges));

int count = 0;

for (int j = 0; j < m; j++) {

for (int k = 0; k < 2; k++) {

/*if(edges[j][k] == 2) {

count++;

}*/

if(k == 0) {

System.out.print("[" + edges[j][k] + "]");

} else {

System.out.println("[" + edges[j][k] + "]");

}

}

}

}

}