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#include <bits/stdc++.h>
using namespace std;
ifstream fin("date.in");
ofstream fout("date.out");
bool subsir(string mic, string mare){
int j = 0;
for(int i = 0; i < mare.size() && j < mic.size(); i++){
if(mic[j] == mare[i]){
j++;
}
}
return j >= mic.size();
}
int main(){
int p, n, raspSize = 0;
vector<string> v, rasp;
fin >> p >> n;
if(p == 1){
string sMax;
for(int i = 0; i < n; i++){
string temp;
fin >> temp;
if(temp.size() > sMax.size()){
sMax = temp;
}else if(temp.size() == sMax.size() && temp < sMax){
sMax = temp;
}
}
fout << sMax;
}else{
v.resize(n);
rasp.resize(n);
for(int i = 0; i < n; i++){
fin >> v[i];
}
for(int i = 0, flag, aux; i < v.size(); i++){
flag = 0;
for(int j = 0; j < v.size() && !flag; j++)
if(j != i)
if(v[i].size() < v[j].size() && subsir(v[i], v[j]))
flag = 1;
if(!flag){
rasp[raspSize++] = v[i];
}
}
fout << raspSize << '\n';
for(int i = 0; i < raspSize; i++){
fout << rasp[i] << '\n';
}
}
return 0;
}