#include <string.h>
#include <fstream>

using namespace std;

ifstream fin("text.in");
ofstream fout("text.out");

char s[10000];
int i,lungime,cuvinte;

int main()
{
    fin.get(s,100);
    for(i=0;i<strlen(s);i++){
        if( (s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z') )
            lungime ++;


        if( ((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z')) && !((s[i+1]>='a' && s[i+1]<='z') || (s[i+1]>='A' && s[i+1]<='Z')) )
            cuvinte ++;

    }

    fout<<lungime/cuvinte;



    return 0;
}