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

int main()
{
    char c[10000],i;
    fin.getline(c,10000);
    int k=0;
    int cuv=0;
    for(i=1;c[i];i++)
    {
        if(c[i]!=' ' and c[i]!='.' and c[i]!='-' and c[i]!='!' and c[i]!='?' and c[i]!=',' and c[i]!=';' and c[i]!=':')
        {
            k++;
        }
        else
            cuv++;
    }
    fout<<k/cuv;



}