#include<fstream>
#include<cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int i,n,nrc,nrl,j,a;
char s[50001][50001];
int main()
{nrc=0; nrl=0; i=0;
while(!f.eof())
{++i;
f.getline(s[i],200);
n=strlen(s[i]);
 a=0;
for(j=0;j<n;++j)
	if((65<=s[i][j]&&s[i][j]<=90)||(97<=s[i][j]&&s[i][j]<=122))
	{++a;
	++nrl;
    }
    else
		if(a>0)
	    {++nrc;
		a=0;
        }
if(a>0)
	++nrc;
}
a=nrl/nrc;
g<<a;
return 0;
}