#include <fstream>
#include <string>
#include <string.h>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char i[100];
int main()
{
    fin.getline(i,100);
    int m=strlen(i);
    int x,nrcuv=0,nrlit=0,inceputcuv=0;
    for(x=0;x<=m;x++)
    {
        if((i[x]>=65&&i[x]<=90)||(i[x]>=97&&i[x]<=122))
        {
            nrlit++;
            if(inceputcuv==0)
            {
                inceputcuv=1;
                nrcuv++;
            }
        }
        else
        {
            inceputcuv=0;
        }


    }
    if(nrlit==0)fout<<"0";
    else fout<<nrlit/nrcuv;
    return 0;
}