#include <fstream>
#include <cctype>
#include <cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char a[1003];
int i,n,nrl,nrc;
int main()
{ f.getline(a,1003);
n=strlen(a);
for(i=0;i<n;i++)
{
    if(isalpha(a[i])) nrl++;
    else if(isalpha(a[i-1]) && !isalpha(a[i]) ) nrc++;
}
if(isalpha(a[n-1])) nrc++;
if(nrc==0) g<<0;
else  g<<nrl/nrc;
    return 0;
}