#include<fstream>
#include<string.h>
using namespace std;
char b[1050000],*p;
int n,x,i,c;
int main()
{
     ifstream fin("text.in");
    ofstream fout("text.out");
    fin.get(b,1050000,'\n');
    fin.get();
    n=strlen(b);
    x=n;
    for(i=0;i<n;i++)
    {
        if(b[i]<'A' || (b[i]>'Z' && b[i]<'a') || b[i]>'z')
        {
            b[i]=' ';
            x--;
        }
    }
    c=0;
    p=strtok(b," ");
    while(p!=0)
    {
        c++;
        p=strtok(0," ");
    }
    fout<<x/c;
    return 0;
}