#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char S[2097152];
int nrcuv,lgtotal;
int main()
{
    fin.getline(S,2097152);
    int k=0,m=strlen(S);
    for( ; k<m; k++)
    {
        while(isalpha(S[k])==0&&k<m)
            k++;
        if(isalpha(S[k])!=0)
        {
            nrcuv++;
            while(isalpha(S[k])!=0&&k<m)
            {
                lgtotal++;
                k++;
            }
        }
    }
    fout<<lgtotal/nrcuv;
    return 0;
}