#include <fstream>
#include <cstring>
using namespace std;
ifstream f("text.in");
ofstream fout("text.out");
int lit, cuv;
string Str;
bool is(char ch)
{
    return (ch<='z' && ch>='a') || (ch<='Z' && ch>='A');
}
void solve()
{
    int i=0;
    bool was=0;
    while(Str[i]!=0)
    {
        if(is(Str[i])==1 && was==0)
        {
            cuv++;
            lit++;
            was=1;
            i++;
            continue;
        }
        if(is(Str[i]==1))
        {
            lit++;
            was=1;
            i++;
            continue;
        }
        if(is(Str[i])==0)
            was=0;
        i++;
    }
}
void citire()
{
    while(!f.eof())
    {
        getline(f,Str);
        solve();
    }
}
void afisare()
{
    if(cuv!=0)
        fout<<lit/cuv<<"\n";
    else fout<<0<<"/n";
}
int main()
{
    citire();
    afisare();
    return 0;
}