#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");

char A[1001];

int main()
{
    int cuv=0,lit=0,i,j;
    while(!fin.eof())
    {
        fin>>A;
        fin.get();
        j=0;
        for(i=0;i<=strlen(A);i++)
        {
            if('a'<=A[i]&&A[i]<='z'||'A'<=A[i]&&A[i]<='Z')
            {
                cout<<A[i];
                j++;
                lit++;
            }
        }
        cout<<endl;
        cuv++;
    }
    lit=lit-j;
    cout<<(lit/--cuv);
    fin.close();
    fout.close();
    return 0;
}