#include<stdio.h>
#include<string.h>
FILE*fin=fopen("text.in","r");
FILE*fout=fopen("text.out","w");
char s[2000005];
int az(char a)
{
    if(a>='a'&&a<='z') return 1;
    return 0;
}
int AZ(char a)
{
    if(a>='A'&&a<='Z') return 1;
    return 0;
}
int main()
{
    int nc=0,i,nl=0;
    fgets(s,2000005,fin);
    int n=strlen(s);
    i=0;
    while(i<n)
    {
      while(i<n&&!az(s[i])&&!AZ(s[i])) i++;
      while(az(s[i])||AZ(s[i]))
      {
        nl++; 
        i++;
      } 
      nc++;
    }
    fprintf(fout,"%d",nl/nc);
    fclose(fin);
    fclose(fout);
    return 0;
}