#include <fstream>
using namespace std;
ofstream fout ("text.out");
ifstream fin  ("text.in" );
int cuv,lungime,stop = 0;
char s[ 65000000 ];
int main()
{
    fin.get( s , 1000000000);
    for(int i = 0 ; i < 30000000 ; i++ )
    {
        int a = s[ i ];
        if( (65 <= a && a <= 90) || ( 97 <= a && a <= 122) )
        {
            if( stop == 0)
            {
                stop++;
                cuv++;
            }
            lungime++;
        }
        else
        {
            if( stop == 1)
            {
                stop = 0 ;
            }
        }
    }
    fout<<lungime / cuv;
}