#include <fstream>
using namespace std;
ifstream cin("text.in");
ofstream cout("text.out");
bool f(char ch)
{
    if('a'<=ch and ch<='z')
        return 1;
    if('A'<=ch and ch<='Z')
        return 1;
    return 0;
}
int main()
{
    ios_base::sync_with_stdio(0);
    long long sum=0,nr=0;
    char ch;
    while(1)
    {
        ch=cin.get();
        if(ch=='\n')
           {
               cout<<sum/nr;
               return 0;
           }
        if(f(ch))
        {
            nr++;
            sum++;
            while(1)
            {
                ch=cin.get();
                if(ch=='\n')
                {
                    cout<<sum/nr;
                    return 0;
                }
                if(f(ch)==0)
                    break;
                sum++;
            }
        }
    }
    return 0;
}