#include <bits/stdc++.h>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char c[1005];
int n;
void Rezolvare()
{
    int cnt=0,aux=0,nrcuv=1,i;
    while(fin.getline(c,1005))
    {
        n=strlen(c);
        for(i=0;i<n;i++)
          if(('a'<=c[i] and c[i]<='z')|| ('A'<=c[i] and c[i]<='Z'))
          {
              cnt++;
              aux=1;
          }
          else if(aux==1)
        {
            nrcuv++;
            aux=0;
        }
    }
    if(nrcuv==0)
        fout<<"0"<<"\n";
    else fout<<cnt/nrcuv<<"\n";
}
int main()
{
    Rezolvare();
    fin.close();
    fout.close();
    return 0;
}