#include <stdio.h>
#include <string>
#define MAXN 1<<20+1

char s[MAXN];
long i,nr,h;

int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    
    fgets(s,sizeof(s),stdin);
    i=0;
    while (i<strlen(s))
    {
          while ( !( ( (s[i] >= 'a') && (s[i] <= 'z') ) || ( (s[i] >= 'A') && (s[i] <= 'Z') ) ) ) ++i;
          while ( (i<strlen(s)) && ( ( (s[i] >= 'a') && (s[i] <= 'z') ) || ( (s[i] >= 'A') && (s[i] <= 'Z') ) )) ++i,++h;
          if (i<strlen(s)) ++nr;
    }
    
    printf("%ld\n",h/nr);
    
    return 0;    
}