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#include <fstream>
using namespace std;
ifstream fin ("text.in");
ofstream fout ("text.out");
int i,nrs,nrlg,cv;
char s[5000003];
int main()
{
while (fin.getline (s,5000000))
{
for (i=0; s[i]; i++)
{
if ((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))
{
nrs++;
nrlg++;
}
else if (nrs>0)
{
nrs=0;
cv++;
}
}
}
if (nrs>0)
cv++;
if (cv!=0)
fout<<nrlg/cv;
else
fout<<0;
return 0;
}