#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair <int, int>
#define fi first
#define se second
const int MAXN = 1e6 + 5;
int cnt, d[MAXN];
bool ispisi[MAXN];
char slovo[MAXN];
string s;
vector <int> v[MAXN];
vector <char> rj;
void dodaj(int a, int idx) {
if (idx >= s.size()) {ispisi[a] = 1; d[a] = max(d[a], 1); return;}
int x = -1;
for (auto e : v[a]) {
if (slovo[e] == s[idx]) x = e;
}
if (x == -1) {
v[a].push_back(cnt);
slovo[cnt] = s[idx];
x = cnt; cnt++;
}
dodaj(x, idx + 1);
d[a] = max(d[a], d[x] + 1);
//cout << a << " " << d[a] << " " << x << " " << d[x] << endl;
}
void dfs(int a) {
//cout << a << " " << d[a] << endl;
if (ispisi[a] == 1) rj.push_back('P');
int mx = 0, x = -1;
for (auto e : v[a]) {
if (d[e] > mx) {mx = d[e]; x = e;}
}
for (auto e : v[a]) {
if (e == x) continue;
rj.push_back(slovo[e]);
dfs(e);
rj.push_back('-');
}
if (x != -1) {
rj.push_back(slovo[x]);
dfs(x);
rj.push_back('-');
}
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
int n;
cin >> n;
cnt = 1;
for (int i = 0; i < n; i++) {
cin >> s; dodaj(0, 0);
}
dfs(0);
int i = rj.size() - 1;
while (rj[i] == '-') {rj.pop_back(); i--;}
cout << rj.size() << "\n";
for (auto e : rj) cout << e << "\n";
return 0;
}
