#include <cstdio>
#include <cstring>
using namespace std;
char x[2000000];
int main()
{
  freopen("text.in","r",stdin);
  fread(x,1,2000000,stdin);
  int n = strlen(x);
  freopen("text.out","w",stdout);
  int litere=0;
  int cuvinte=0;
  for(int i = 0; i < n; i++)
  {
    if(('A'<=x[i]&&x[i]<='Z')||('a'<=x[i]&&x[i]<='z'))
    litere++;
    else
    if(i>0&&(('A'<=x[i-1]&&x[i-1]<='Z')||('a'<=x[i-1]&&x[i-1]<='z')))
    cuvinte++;
  }
  if(('A'<=x[n-1]&&x[n-1]<='Z')||('a'<=x[n-1]&&x[n-1]<='z')) cuvinte++;
  printf("%d\n",litere/cuvinte);
}