#include <bits/stdc++.h>

typedef long double ld;
typedef long long ll;
using namespace std;
int di[] = {1, 0, -1, 0, 0, 1, -1, 1};
int dj[] = {0, 1, 0, -1, -1, 0, 1, -1};

const ll oo = 1e18;
const int N = 505, M = 2e4 + 5, MOD = 998244353;
#define EPS 1e-9

int n, m, lst[N][M];
string s[N];

int main() {
    ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    //memset(dp, -1, sizeof dp);
    cin >> n >> m;
    for (int i = 1; i <= n; i++) cin >> s[i], lst[i][m + 1] = 1e9;
    for (int i = 1; i <= n - 1; i++) {
        for (int j = m; j >= 1; j--) {
            lst[i][j] = lst[i][j + 1];
            if (s[i][j - 1] < s[i + 1][j - 1]) lst[i][j] = j;
            if (s[i][j - 1] > s[i + 1][j - 1]) lst[i][j] = 1e9;
        }
    }
    int ans = m + 1;
    int x, y;
    for (int j = 1; j <= m; j++) {
        int mx = j;
        for (int i = 1; i <= n - 1; i++) mx = max(mx, lst[i][j]);
        if (mx - j + 1 < ans) ans = mx - j + 1, x = j, y = mx;
    }
    cout << x << " " << y;
    return 0;
}