#include<stdio.h>
using namespace std;
FILE*in=fopen("text.in","r");
FILE*out=fopen("text.out","w");
char c1;
int nrlit,nrcuv,ok;
int main()
{
    while(!feof(in))
    {
    fscanf(in,"%c",&c1);
    if(c1>='A' && c1<='Z' || c1>='a' && c1<='z')
    {
        ok=1;
        nrlit++;
    }
    else
    if(ok==1)
        {
        nrcuv++;
        ok=0;
        }
    }
    if(ok==1)
    nrcuv++;
fprintf(out,"%d",nrlit/nrcuv);
fclose(in);
fclose(out);
return 0;
}