#include <iostream>
#include <fstream>
#include <cstring>

using namespace std;

char x ;
int i , n , k , K , ok;

bool bun(char x)
{
    if((x >= 65 && x <= 90) || (x >=97 && x <= 122))
        return true;
    return false;
}
int main()
{
    ifstream f ("text.in");
    ofstream g ("text.out");
    x = f.get();
    while(!f.eof())
    {
        if(bun(x))
        {
            K++;
            ok = 1;
        }
        else
        if(ok == 1)
        {
            k++;
            ok = 0;
        }
        x = f.get();
    }
    g << K / k;
    return 0;
}