#include<iostream>

#include<cstdio>

#include<cstring>

#include<algorithm>

#define x first

#define y second

using namespace std;

typedef pair<char,char> PCC;

const int N = 3010;

PCC pcc[N];

int main()

{

 int n, len;

 cin >> n >> len;

 if(n == 1){

   puts("1");

   return 0;

 }

 for(int i = 1; i <= n; i ++)

 {

   string s;

   cin >> s;

   char minc = s[0], maxc = s[0];

   for(int j = 1; j < len; j ++ )

   {

     if(s[j] < minc) minc = s[j

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