#include <stdio.h>
#include <string.h>
#include <ctype.h>
#define DIM 1000000000

char sir[DIM];
int n,ch,cuv,i;

int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);

    while(gets(sir))
    {
        n=strlen(sir);
        for(i=0; i<n; ++i)
        {
            if(isalpha(sir[i]))
            {
               while(isalpha(sir[i]))
               {
                   ch++;
                   i++;
               }
               cuv++;
            }
        }
    }
    printf("%d",ch/cuv);
}