#include <iostream>
#include <cstdio>
using namespace std;
int i,s,n;
char x,y;
bool litera(char x)
{
    return x>='a'&&x<='z'||x>='A'&&x<='Z';
}
int main()
{
    y=';';
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    while(cin.get(x))
    {
        if(litera(x))
        {
            s=s+1;
            if(!litera(y))
            {
                n=n+1;
            }

        }
        y=x;
    }
    cout<<s/n;
}