#include<iostream>
#include<cstring>
#include<cstdio>
using namespace std;
bool litera(char a)
{
    return a<='z'&&a>='a'||a<='Z'&&a>='A';
}
int main()
{
    char c;int i,nr=0,s=0,l;bool k=0;
    freopen("text.in","r",stdin);freopen("text.out","w",stdout);
    while(scanf("%c",&c)!=EOF)
        if(litera(c))
        {
            if(k==0)
                nr++,k=1;
            s++;
        }
        else
            k=0;
    if(nr)
        cout<<s/nr;
    else
        cout<<0;
     
}