#include <fstream>
#include <cstring>
using namespace std;
ifstream cin("text.in");
ofstream cout("text.out");

char s[2000000];
int m, l, i, j, n, k;

bool litera(char c)
{
    return (c>='a' && c<='z' || c>='A' && c<='Z');
}
int main()
{
    cin.get(s, 2000000);
    l=strlen(s);
    while(i<l)
        if(litera(s[i]))
        {
            n++;
            k++;
            j=i+1;
            while(litera(s[j]) && j<l) j++, k++;
            i=j;
        }
        else i++;
    cout<<k/n;
    return 0;
}