#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>
// #include <ext/rope>
using namespace std;
// using namespace __gnu_pbds;
typedef long long ll;
typedef unsigned long long ull;
typedef unsigned int uint;
typedef long double ld;
template <class T>
using VV = vector<vector<T>>;
using VI = vector<int>;
using VVI = vector<vector<int>>;
using VL = vector<long long>;
using VVL = vector<vector<long long>>;
using VC = vector<char>;
using VVC = vector<vector<char>>;
using VB = vector<bool>;
using VVB = vector<vector<bool>>;
using VD = vector<double>;
using VVD = vector<vector<double>>;
using PII = pair<int, int>;
using PLL = pair<long long, long long>;
using PIL = pair<int, long long>;
using PLI = pair<long long, int>;
using VPII = vector<pair<int, int>>;
using VPLL = vector<pair<long long, long long>>;
#define LINE '\n'
#define SPACE ' '
#define PB push_back
#define FOR(i, a, b) for (int i = (a); i < (int(b)); i++)
#define FORE(i, a, b) for (int i = (a); i <= (int)((b)); i++)
#define ALL(x) x.begin(), x.end()
#define RALL(x) x.rbegin(), x.rend()
#define sq(a) ((a) * (a))
#define sz(x) ((int)x.size())
#define fastio() \
ios_base::sync_with_stdio(false); \
cin.tie(nullptr); \
cout.tie(nullptr)
#define debug(x) cerr << #x << " = " << x << endl;
const ll MOD = 1e9 + 7;
template <class T>
inline void maxi(T &a, T b)
{
a = max(a, b);
}
template <class T>
inline void mini(T &a, T b)
{
a = min(a, b);
}
template <class T>
inline void addi(T &a, T b)
{
a = (a + b) % MOD;
}
template <class T>
inline void subi(T &a, T b)
{
a = (a - b + MOD) % MOD;
}
template <class T>
inline T add(T a, T b)
{
return (a + b) % MOD;
}
template <class T>
inline T sub(T a, T b)
{
return (a - b + MOD) % MOD;
}
template <class T>
inline T mul(T a, T b)
{
return ((a % MOD) * (b % MOD)) % MOD;
}
constexpr ll binpow(ll a, ll b, ll mod)
{
ll res = 1;
while (b > 0)
{
if (b & 1)
{
res = (res * a) % mod;
}
a = (a * a) % mod;
b >>= 1;
}
return res;
}
const int INF = 1e9;
const int MAX_N = 2e5 + 3;
static const int MAX_W = 1e6 + 5;
struct Trie
{
int triesz;
array<array<int, 26>, MAX_W> next;
array<int, MAX_W> ends;
Trie() : triesz(0)
{
FOR(i, 0, MAX_W)
{
next[i].fill(-1);
}
}
void add(string &s)
{
int node = 0;
for (char c : s)
{
if (next[node][c - 'a'] != -1)
{
node = next[node][c - 'a'];
}
else
node = next[node][c - 'a'] = ++triesz;
}
ends[node]++;
}
};
Trie trie;
string ans = "";
array<int, MAX_W> deep;
array<int, MAX_W> dvert;
void dfs_deep(int node, int d = 0)
{
deep[node] = 0;
FOR(i, 0, 26)
{
if (int v = trie.next[node][i]; v != -1)
{
dfs_deep(v, d + 1);
if (deep[node] == -1 || deep[node] < deep[v] + 1)
{
dvert[node] = i;
deep[node] = deep[v] + 1;
}
}
}
}
void dfs(int node, char c)
{
ans.push_back(c);
FOR(i, 0, trie.ends[node])
{
ans.push_back('P');
}
FOR(i, 0, 26)
{
if (i == dvert[node])
continue;
if (int v = trie.next[node][i]; v != -1)
{
dfs(v, char('a' + i));
}
}
if (int i = dvert[node]; i != -1)
dfs(trie.next[node][i], char('a' + i));
ans.push_back('-');
}
void solve()
{
dvert.fill(-1);
deep.fill(0);
int n;
cin >> n;
FOR(i, 0, n)
{
string s;
cin >> s;
trie.add(s);
}
dfs_deep(0);
dfs(0, 0);
ans.erase(0, 1);
while (ans.back() == '-')
ans.pop_back();
cout << sz(ans) << LINE;
for (auto c : ans)
{
cout << c << LINE;
}
}
int main()
{
fastio();
int t = 1;
// cin >> t;
while (t--)
solve();
}
