#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
int i, n, nr_lit, nr_c, j, m;
char sir[1000002];

int main()
{
    fin.getline(sir+1, 1000002);
    n=strlen(sir+1);

    for(i=1; i<=n; i++)
        if ( (sir[i]>='a' && sir[i]<='z') || (sir[i]>='A' && sir[i]<='Z') ) nr_lit++;

    if(nr_lit==0)
    {
        fout<<0;
        return 0;
    }

    for(i=1; i<=n; i++)
        if( (sir[i]>='a' && sir[i]<='z') || (sir[i]>='A' && sir[i]<='Z') )
        {
            j=i;
            while(j+1<=n &&  ((sir[j]>='a' && sir[j]<='z') || (sir[j]>='A' && sir[j]<='Z')) )
                j++;
            nr_c++;
            i=j;
        }

    m=nr_lit/nr_c;
    fout<<m;
    return 0;
}