#include <fstream>

using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");

char s[1000005];

int main()
{
    int cnt=0,lun=0,i;
    fin.getline(s,1000000);
    for(i=0;s[i+1]!=0;i++)
    {
        if((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z')) lun++;
        else if ((s[i]<'a'||s[i]>'z'||s[i]<'A'||s[i]>'Z')&&((s[i+1]>='a'&&s[i+1]<='z')||(s[i+1]>='A'&&s[i+1]<='Z'))) cnt++;
    }
    fout<<lun/cnt<<"\n";
    return 0;
}