#include <fstream>
#include <string.h>
using namespace std;
ifstream cin("text.in");
ofstream cout("text.out");
int main()
{
    int nrcuvinte=0;
    int nrlitere=0;
    char c;
    char lastChar=0;
    while(cin>> noskipws >>c)
    {

        if(isalpha(c))  nrlitere++;
        if(lastChar!=0)
        {
            if(!isalpha(c) && isalpha(lastChar))
                nrcuvinte++;
        }
        lastChar=c;
    }
    cout<<nrlitere/nrcuvinte;
    return 0;
}