#include<fstream>
using namespace std;
ifstream cin("text.in");
ofstream cout("text.out");
char c[2000000],x;
int n;
int rez,k;
int main(){
    while(cin.get(x)){
        c[n] = x;
        n++;
    }
 
    int i = 0;
    while(!((c[i]>='a'&&c[i]<='z')||(c[i]>='A'&&c[i]<='Z'))&& i <n)i++;
    while(i < n){
        while(((c[i]>='a'&&c[i]<='z')||(c[i]>='A'&&c[i]<='Z'))&& i <n){
 
            i++;
            rez++;
        }
 
        k++;
        while(!((c[i]>='a'&&c[i]<='z')||(c[i]>='A'&&c[i]<='Z'))&& i <n)i++;
    }
    if(k == 0)cout <<"0";
    else cout <<rez/k;
}