#include <fstream>
#include <cstring>

using namespace std;

ifstream f("text.in");
ofstream g("text.out");

char s[256],*p;
int nr,x,i,nr1;
bool OK;

int main()
{
    f.getline(s,sizeof(s));
    for(i=0; s[i]; i++)
    {
        if(isalpha(s[i]) && !OK)
            OK=1,nr++,nr1++;
        else if(isalpha(s[i]))
            nr1++;
        else if(!isalpha(s[i]))
            OK=0;
    }
    g<<nr1/nr;
    return 0;
}