#include<fstream.h>
#include<string.h>
char s[2000009];
long i,lung,nrcuv;
int main()
{ifstream f("text.in");ofstream h("text.out");
f.getline(s,2000009);
for(i=0;i<strlen(s);i++)
{
while(s[i]<'A' || ('Z'<s[i] && s[i]<'a') || 'z'<s[i])
i++;
nrcuv++;
while(('a'<=s[i] && s[i]<='z') || ('A'<=s[i] && s[i]<='Z'))
{i++;lung++;}
}
h<<lung/nrcuv;
return 0;}