#include <fstream>
#include <algorithm>
#include <vector>
#define x first
#define y second
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
int n,i,j,ok,cuv;
char v[1030*1030];
int main()
{
    fin.get(v,1030*1030);
    while(v[i])
    {
        if((v[i]<='Z'&&v[i]>='A')||(v[i]<='z'&&v[i]>='a'))
        {
            cuv++;
            j++;
            while((v[i+1]<='Z'&&v[i+1]>='A')||(v[i+1]<='z'&&v[i+1]>='a'))
                i++,j++;
        }
        i++;
    }
    fout<<j/cuv;
}