#include <bits/stdc++.h>
using namespace std;
long long x[500], x2[500];
int n, m;
long long o[20];
long long oo = 1e15;
int pp, u;
void go(int cr, int sum, long long p) {
  if ((1 << cr) > u) {
    if (x[sum] < p && sum > 0) {
      x[sum] = p;
      x2[sum] = pp;
    }
    return;
  }
  if (x[sum] < p && sum > 0) {
    x[sum] = p;
    x2[sum] = pp;
  }
  go(cr + 1, sum, p);
  go(cr + 1, sum + (1 << cr), min(p, o[cr]));
}
int main() {
  ios_base::sync_with_stdio(0);
  cin >> n >> m;
  u = (1 << (m - 1));
  for (int i = 1; i <= n; i++) {
    for (int j = 0; j < m; j++) {
      cin >> o[j];
    }
    pp = i;
    go(0, 0, oo);
  }
  u = (1 << m) - 1;
  long long mx = 0, idx = 1, idx2 = 1;
  for (int i = 0; i <= u; i++) {
    for (int j = 0; j <= u; j++) {
      if ((j | i) == u) {
        if (min(x[i], x[j]) > mx) {
          mx = min(x[i], x[j]);
          idx = x2[i];
          idx2 = x2[j];
        }
      }
    }
  }
  cout << idx << ' ' << idx2;
  return 0;
}
