#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int main()
{
int i,x=0,c=0,ok=0; char s[10000];
f.get(s,10000);f.get();
for(i=0;i<=strlen(s);i++)
{
    if((s[i]>='A' and s[i]<='Z')or (s[i]>='a' and s[i]<='z'))
    {
        x++;ok=1;
    }
    else if(ok==1)
        c++,ok=0;
}
cout<<x/c;
    return 0;
}