#include <fstream>
#include <cstring>
using namespace std;
ifstream cin("text.in");
ofstream cout("text.out");

int cate = 0, cnt = 0;
bool litera(char c)
{
    if (c >= 'a' && c <= 'z' )
        return true;
    if ( c >= 'A' && c <= 'Z' )
        return true;
    return false;
}
int main()
{
    char sir[1000000 + 5];
    cin.getline(sir, 1000000 + 5);
    int n = strlen(sir), i;
    for ( i = 0; i < n; ++i )
    {
        if ( litera(sir[i]) == true )
        {

            while ( litera(sir[i]) == true )
                ++cate, ++i;
            ++cnt;
        }
    }
    cout << cate / cnt << endl;
    return 0;
}