#include<fstream>

using namespace std;

char a;
int i,sum,counter=1;

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

int main()
{
    a='0';
    while(a!='\n')
    {
        fin>>noskipws>>a;
        if(a>='a' && a<='z')  sum++;
        if(a>='A' && a<='Z')  sum++;
        if(a==' ')   counter++;
        i++;
    }
    fout<<sum/counter;
}