#include <bits/stdc++.h>
#define re return
#define pb push_back
#define po pop_back
#define all(x) (x).begin(), (x).end()
#define fi first
#define se second
#define ss second.second
#define sf second.first
#define ff first.first
#define fs first.second
#define si size
#define sqrt(x) sqrt(abs(x))
#define mp make_pair
#define pi 3.14159265359
#define er erase
#define in insert
#define em empty
#define ft front
#define fo(i,n) for(i = 0; i < n; i++)
#define ro(i,n) for(i = n - 1; i >= 0; i--)
#define fr(i,j,n) for(i = j; i < n; i++)
#define rf(i,j,n) for(i=n-1;i>=j;i--)
typedef std::vector<int> vi;
typedef std::vector<vi> vvi;
typedef std::pair<int,int> ii;
typedef std::vector<ii> vii;
typedef std::vector<std::string> vs;
typedef double dl;
typedef long double ld;
typedef long long ll;
typedef std::pair<ll, ll> pll;
typedef std::vector<ll> vll;
#define filename ""
using namespace std;
    char c[(int)1e5*3+10];
    set<string> s;
int main()
{
    int i;
    string t="";
    int o=0,j;
    set<string>::iterator q;
    while(gets(c))
    {
        for(i=0;c[i]!='\0';)
        {
            while(c[i]>='a'&&c[i]<='z')
            {
                t+=c[i];
                i++;
            }
            fo(j,t.length())
            {
                q=s.lower_bound(t.substr(0,j+1));
                if (q==s.end()) break;
                if (q->substr(0,j+1)!=t.substr(0,j+1)) break;
                if (q->length()<=t.length())
                {
                    if (*q==t.substr(0,q->length()))
                    {
                        q++;
                        if (q==s.end()||q->substr(0,j+1)!=t.substr(0,j+1))
                        {
                            cout<<t<<' '<<*q<<'\n';
                            o-=t.length()-j;
                            break;
                        }
                    }
                }
            }
            s.in(t);
            t="";
            while(c[i]!='\0'&&(c[i]<'a'||c[i]>'z'))
            {
                i++;
            }
        }
        o+=i+1;
    }
    cout<<o;
}