#include <iostream>
using namespace std;

int n, m;
int apay[25][25], bpay[25][25];

int main() {
  for (int tc = 0; ; tc++) {
    int i, j;

    cin >> m >> n;
    if (n*m == 0)
      return 0;
    for (i = 0; i < m; i++)
      for (j = 0; j < n; j++)
	cin >> apay[i][j];
    for (i = 0; i < m; i++)
      for (j = 0; j < n; j++)
	cin >> bpay[i][j];

    int solves = 0;
    int solve[500][2];

    for (i = 0; i < m; i++)
      for (j = 0; j < n; j++) {
	bool isGood = true;
	for (int i2 = 0; i2 < m; i2++)
	  if (apay[i2][j] > apay[i][j])
	    isGood = false;
	for (int j2 = 0; j2 < n; j2++)
	  if (bpay[i][j2] > bpay[i][j])
	    isGood = false;
	if (isGood ) {
	  solve[solves][0] = i+1;
	  solve[solves][1] = j+1;
	  solves++;
	}
      }

    cout << solves << endl;
    for (i = 0; i < solves; i++)
      cout << solve[i][0] << " " << solve[i][1] << endl;
  }
}