#include <fstream>
#include <cstring>
using namespace std;
ifstream cin("text.in");
ofstream cout("text.out");
int main()
{
    int length_sum=0;
    int cnt=1;
    int length;
    bool ok=true;
    char text[10000];
    cin.get(text,10000);
    char* word;
    word= strtok(text," ,!:;.?");
    length_sum+=strlen(word);
    while(word!=NULL){
        length=strlen(word);
        for(int i=0;i<=strlen(word);i++)
        if(!isalnum(word[i]))
        length--;
        length_sum+=length;
        cnt++;
        word=strtok(NULL," ");
    }
    cout<<length_sum/cnt;

    return 0;
}