#include <bits/stdc++.h>
using namespace std;
#define int long long
#define faster ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define NMAX 25005
#define pb push_back
#define fi first
#define se second
int n;
struct gamb{
int tam;
char c;
};
struct node{
map<char,int>next;
int id;
int tam;
char c;
node(){
id=-1;
next.clear();
tam=0;
c=' ';
}
};
vector<node>v;
string resp;
int espaco=0;
int new_node(){
v.pb(node());
return v.size()-1;
}
void dfs(int x){
for(auto it:v[x].next){
dfs(v[x].next[it.fi]);
v[x].tam=max(v[x].tam,v[v[x].next[it.fi]].tam+1);
}
if(v[x].id==1){
v[x].tam=1;
}
}
bool func(gamb a, gamb b){
return a.tam<b.tam;
}
void solve(int x){
vector<gamb>g;
gamb aux2;
if(x!=0){
espaco++;
resp.pb(v[x].c);
if(v[x].id==1){
resp.pb('P');
while(espaco--)resp.pb('-');
}
}
for(auto it:v[x].next){
aux2.c=it.fi;
aux2.tam=v[v[x].next[it.fi]].tam;
g.pb(aux2);
}
if(g.size()>1)sort(g.begin(),g.end(),func);
for(auto it:g){
solve(v[x].next[it.c]);
}
}
vector<string>s;
int32_t main(){
cin>>n;
int x;
int inicio=new_node();
for(int i=0; i<n; i++){
s.pb("penis");
cin>>s[i];
}
sort(s.begin(),s.end());
for(int i=0; i<n; i++){
x=inicio;
for(auto it:s[i]){
if(v[x].next.count(it)==0){
v[x].next[it]=new_node();
}
x=v[x].next[it];
v[x].c=it;
}
v[x].id=1;
}
dfs(inicio);
solve(inicio);
char aooo=resp.back();
while(aooo=='-'){
resp.pop_back();
aooo=resp.back();
}
cout<<resp.size()<<"\n";
for(auto it:resp)cout<<it<<"\n";
}
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