#include<fstream.h>
#include<string.h>
#include<ctype.h>
ifstream f("text.in");
ofstream g("text.out");
int main()
{int i,x=0,z=0,c=0;
char sir[256];
f.get(sir,256);
for(i=0;i<strlen(sir);i++)
{if(isalpha(sir[i])) x++;
if(isdigit(sir[i])) x++;}
for(i=0;i<strlen(sir);i++)
{if(isalpha(sir[i])!=0||isdigit(sir[i])!=0)
z++;
else if(z!=0) {c++;z=0;}}
g<<x/c;
f.close();
g.close();
return 0;}