#include <cstdio>

using namespace std;

long int nr,x;
char c1,c;
bool ok;

int main()
{
    freopen ("text.in","r",stdin);
    freopen ("text.out","w",stdout);
    nr=0;x=0;
    while (!feof(stdin)) {
           scanf("%c",&c);
           ok=false;
           if ((c>='a' &&c<='z')||(c>='A'&&c<='Z')) {nr++;ok=true;}
           if (ok==false &&((c1>='a' &&c1<='z')||(c1>='A'&&c1<='Z'))) x++;
           c1=c;
           }
           printf("%d",nr/x);

    fclose(stdin);
    fclose(stdout);
    return 0;
}