#include <cstdio>
#include <cctype>

#define MAX 1024*1024

int main(){

  char T[MAX+100];
  int c, wlength, wcount, i, word;

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

  c = fread(T, sizeof(char), MAX+100, stdin);

  wcount=0; wlength=0; word=0;
  for(i=0; i<c; i++){
    if(isalpha(T[i])){
      wlength++;
      word=1;
    }
    else if(word){
      wcount++;
      word=0;
    }
  }
  
  if(word)
    wcount++;

  if(!wlength || !wcount)
    printf("0\n");
  else
    printf("%d\n", wlength/wcount);

  return 0;

}