#include <stdio.h>

using namespace std;

int main()
{
    FILE *in,*out;
    in=fopen("text.in","r");
    out=fopen("text.out","w");
    int i;
    char c;
    int j,S;
    i=0;
    S=0;
    j=0;
    while(c!='\n')
    {
        fscanf(in,"%c",&c);
        if((c>='A' && c<='Z') || (c>='a' && c<='z') ) i++;
        else
        {
          if(i==0) j--;
          S=S+i;
          j++;
          i=0;
        }


    }
   // fprintf(out,"%d ",S);
    S=S/j;
    //fprintf(out,"%d ",j);
    fprintf(out,"%d",S);
    return 0;
}