#include <string.h>
#include <stdio.h>
using namespace std;
FILE *f=fopen("text.in","r");
FILE *g=fopen("text.out","w");

int main()
{

    int i=0,lungt=0,nrcuv=0,ok=0;
    char x;
    while(fscanf(f,"%c",&x)&& x!='\n')
    {

        if((x>='a'&& x<='z' )||(x>='A' && x<='Z'))
            {
                lungt++;
                ok=1;
            }else
        if(ok)
        {
            ok=0;
            nrcuv++;
        }

    }
   if(ok==1)nrcuv++;
    fprintf(g,"%d",lungt/nrcuv);
    return 0;
}