#include<iostream>
#include<fstream>
#include<string.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
unsigned int i,k=0,t=0;
char s[100],*p;
int main(){
    f.getline(s,100);
    for(i=0;i<strlen(s);i++)
        if(s[i]>='a'&&s[i]<='z'||s[i]>='A'&&s[i]<='Z')
        k++;
        p=strtok(s," ");
        while(p!=0){
                t++;
        p=strtok(NULL," ");}
        g<<k/t;
        return 0;}