This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
/*
* Author: Nonoze
* Created: Monday 05/08/2024
*/
#include <bits/stdc++.h>
using namespace std;
#ifndef _IN_LOCAL
#define dbg(...)
#endif
#define endl '\n'
#define endlfl '\n' << flush
#define quit(x) return (void)(cout << x << endl)
template<typename T> void read(T& x, bool write=0, bool write2=1, bool nothing=1) { if (write && write2) cout << x << endl; else if (write) cout << x << ' '; else cin >> x;}
template<typename T1, typename T2> void read(pair<T1, T2>& p, bool write=0, bool nothing=1, bool write2=1) { read(p.first, write, 0), read(p.second, write, 0); if (write && write2) cout << endl;}
template<typename T> void read(vector<T>& v, bool write=0) { for (auto& x : v) read(x, write, 0, 1); if (write) cout << endl; }
template<typename T1, typename T2> void read(T1& x, T2& y, bool write=0) { read(x, write), read(y, write); if (write) cout << endl; }
template<typename T1, typename T2, typename T3> void read(T1& x, T2& y, T3& z, bool write=0) { read(x, write), read(y, write), read(z, write); if (write) cout << endl; }
template<typename T1, typename T2, typename T3, typename T4> void read(T1& x, T2& y, T3& z, T4& zz, bool write=0) { read(x, write), read(y, write), read(z, write), read(zz, write); if (write) cout << endl; }
template<typename T> void print(T x) { read(x, 1); }
template<typename T1, typename T2> void print(T1 x, T2 y) { read(x, y, 1); }
template<typename T1, typename T2, typename T3> void print(T1 x, T2 y, T3 z) { read(x, y, z, 1); }
template<typename T1, typename T2, typename T3, typename T4> void print(T1 x, T2 y, T3 z, T4 zz) { read(x, y, z, zz, 1); }
#define sz(x) (int)(x.size())
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define cmin(a, b) a = min(a, b)
#define cmax(a, b) a = max(a, b)
#define int long long
const int inf = numeric_limits<int>::max() / 4;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int MOD = 1e9+7, LOG=25;
void solve();
signed main() {
ios::sync_with_stdio(0);
cin.tie(0);
int tt=1;
// cin >> tt;
while(tt--) solve();
return 0;
}
string ans;
struct trie {
map<char, trie*> children;
int cnt=0;
bool is_end = false;
void add(string &x, int pos=0) {
is_end=0;
if (pos==sz(x)) {
is_end = 1;
cnt++;
return;
}
if (!children.count(x[pos])) children[x[pos]] = new trie();
children[x[pos]]->add(x, pos+1);
}
void print(string &lst, int pos=0, bool isin=1) {
if (is_end) {
while (cnt--) ans+='P';
return;
}
for (auto u: children) {
if (!isin || u.fi!=lst[pos]) {
ans+=u.fi;
u.se->print(lst, pos+1, 0);
ans+='-';
}
}
if (isin) {
ans+=lst[pos];
children[lst[pos]]->print(lst, pos+1, 1);
}
}
};
int n, k, m, q;
vector<string> a;
void solve() {
read(n);
a.clear(), a.resize(n); read(a);
trie *root = new trie();
string mx="";
for (auto &x: a) {
if (sz(x)>sz(mx)) mx=x;
root->add(x);
}
root->print(mx, 0);
cout << sz(ans) << endl;
for (auto u: ans) cout << u << endl;
}
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