#include <cstdio>
#include <cctype>

#define MAX 1024*1024

int main(){

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

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

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

  wcount=1;
  for(i=0; i<c; i++){
    if(T[i]==' ')
      wcount++;
    else if(isalpha(T[i]))
      wlength++;
  }
  
  printf("%d\n", wlength/wcount);

  return 0;

}