using namespace std;
#include <fstream>
#include <cstring>

ifstream fin("text.in");
ofstream fout("text.out");

char x[1048589];

int main()
{

    int n=0,nr=0,i;

while(fin.getline(x,1048589))

    for(i=0;x[i];)
    {
        if((x[i]>='a' && x[i]<='z') || (x[i]>='A' && x[i]<='Z'))
        {
        while ((x[i]>='a' && x[i]<='z') || (x[i]>='A' && x[i]<='Z'))
         {i++;n++;}
        nr++;
        }
        else i++;
  }
fout<<n/nr;
return 0;
}