#include <fstream>

using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char s[2000005],sep[]={'-','.',',','?','!'};
int n,i,j,cnt=0,nrcuv=0;
void Citire(char s[])
{
    fin.getline(s,2000000);

}
void Text(char s[])
{
    i=0;
    while(s[i]!=0)
    {
        while(s[i]==' ')
            i++;
        if(s[i]!=0  )
            while(s[i]>='a' && s[i]<='z' || s[i]>='A' && s[i]<='Z' )
        {
            cnt++; i++;
        }
        nrcuv++;
        i++;
    }
}
int main()
{ Citire(s);
Text(s);
int d=cnt/nrcuv;
fout<<d;

    return 0;
}