#include <fstream>
#include <string.h>

using namespace std;
ifstream cin("text.in");
ofstream cout("text.out");

int main()
{
    string x;
    int cuv = 0,litere=0;
    getline(cin,x,'\n');
    for(int i = 0;i<x.size();i++)
    {
        if(x[i] == ' ' || (x[i] == '-'&&i!=0))
            cuv++;
        if( ( (int)x[i]<=122 && (int)x[i] >=97) || ((int)x[i]<=90 && (int)x[i] >=65))
            litere++;
    }
    if(x[0] == '-' && x[1] == ' ') cuv--;
    cuv++;
    //cout<<"Cuvinte: "<<cuv<<endl<<"Litere: "<<litere<<endl;
    cout<<litere/cuv;
}