#include <bits/stdc++.h>
using namespace std;
string s;
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    int c,nrc;
    char ch;
    c=nrc=0;
    ch=getchar();
    while(  ch!=EOF){
        if(isalpha(ch)){
            nrc++;
            while(ch!='\n' && ch!=EOF && isalpha(ch))
                c++,ch=getchar();
        }
        else
            ch=getchar();
    }
    printf("%d",c/nrc);
    //cout<<s;
    return 0;
}