#include <fstream>
#include <string.h>
using namespace std;

ifstream fin("text.in");
ofstream fout("text.out");

int main()
{
    char a[100000];
    int i = 0, ok;
    int nrcuv = 0, nrlit = 0;
    while( fin>>a && a[0] != NULL )
    {
        ok = 0;
        for ( i = 0; i < strlen(a); ++i )
        {
            if ( ok == 0 && (a[i] > 64 && a[i] < 91) || ( a[i] > 96 && a[i] < 123))
            {
                nrcuv++;
                nrlit++;
                ok = 1;
            }
            else
            if ( ok == 1 && ( a[i] > 64 && a[i] < 91) || ( a[i] > 96 && a[i] < 123))
            {
                nrlit++;
            }
            else
            ok = 0;

        }
    }
    fout << nrlit/nrcuv;

    fin.close();
    fout.close();
    return 0;
}