#include <iostream>
#include <fstream>
#include <cstring>
#include <cctype>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int main()
{char s[1000];
int i,nrcuv=0,nr=0;
cin.get(s,1000);
i=0;
while(i<strlen(s))
    if(isalpha(s[i]))
{
    nrcuv++;
    while(isalpha(s[i]))
        {nr++;i++;}
}else i++;
cout<<nr/nrcuv;
}