#include <fstream>
#include <cstring>
using namespace std;
ifstream fin ("text.in");
ofstream fout ("text.out");
char v;
int main()
{
    int literecuv=0,lt=0,nrc=0;
    while(fin.get(v))
    {
        if((v>='a' && v<='z') || (v>='A' && v<='Z'))
        {
        literecuv++;
        lt++;
        }
        else
        {
        if(literecuv!=0)
            nrc++;
            literecuv=0;
        }
    }
    if(nrc==0)
    fout << "0\n" << endl;
        fout<<lt/nrc;
    return 0;
}