#include<string.h>
#include<ctype.h>
#include<fstream.h>
ifstream f("text.in");
ofstream g("text.out");
char a[50000];

int main()
{long c=0,l=0;
while(!f.eof())
{f.get(a,30000);
f.get();
for(long i=0;i<=strlen(a);i++)
if(isalpha(a[i])) {l++;
		   if(isalpha(a[i+1])==0) c++;
		   }
}
g<<l/c;
return 0;
}