void pln(String s) {
try {
bw.write(s);
bw.write(System.lineSeparator());
} catch (Exception ex) {
}
}
/** @param args */
public static void main(String[] args) throws Exception {
File file = new File("input.txt");
if (file.exists()) {
System.setIn(new BufferedInputStream(new FileInputStream("input.txt")));
}
out = System.out;
bw = new BufferedWriter(new PrintWriter(out));
// sc = new Scanner(System.in);
br = new BufferedReader(new InputStreamReader(System.in));
C231 t = new C231();
t.solve();
bw.close();
}
public void solve() throws Exception {
String s = br.readLine();
String[] sp = s.split(" ");
int n = parseInt(sp[0]);
int m = parseInt(sp[1]);
int fl = 0;
int hf = 0;
int zr = 0;
for (int i = 0; i < n; i++) {
s = br.readLine();
sp = s.split(" ");
for (int j = 0; j < sp.length; j++) {
if (sp[j].equals("11")) {
fl++;
} else if (sp[j].equals("00")) {
zr++;
} else {
hf++;
}
}
}
int[][] ans = new int[n][m];
int fla = fl % m;
int row = 0;
int col = 0;
if (fl > 0) {
for (row = 0; row < n; row++) {
for (col = 0; col < m; col++) {
ans[row][col] = 1;
fl--;
if (fl == 0) {
break;
}
}
if (fl == 0) {
break;
}
}
col++;
}
if (col == m) {
row++;
col = 0;
}
if (hf > 0) {
for (int j = m - 1; j >= col; j--) {
ans[row][j] = 2;
hf--;
if (hf == 0) {
break;
}
}
}
boolean flag = true;
for (int i = n - 1; i >= 0; i--) {
if (hf == 0) break;
for (int j = m - 1; j >= 0; j--) {
if (flag) {
ans[i][j] = 3;
} else {
ans[i][j] = 2;
}
hf--;
if (hf == 0) break;
}
flag = !flag;
}
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
if (j != 0) {
bw.write(" ");
}
if (ans[i][j] == 1) {
bw.write("11");
} else if (ans[i][j] == 2) {
bw.write("01");
} else if (ans[i][j] == 3) {
bw.write("10");
} else {
bw.write("00");
}
}
bw.write("\n");
}
}
void pl(String s) {
try {
bw.write(s);
} catch (Exception ex) {
}
}