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#include<fstream>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
const int Dim=1024*1024+1;
char C[Dim+10];
int Ltext,Nrcuv;
int Lungime(int i)
{
int j;
for( j=i ; C[j]; j++)
if(isalpha(C[j]))
Ltext++;
else
break;
j--;
Nrcuv++;
return j;
}
int main()
{
fin.getline(C,Dim+5);
fin.close();
for(int i=0; C[i]; i++)
if(isalpha(C[i]))
i=Lungime(i);
if(Nrcuv==0)
fout<<0<<'\n';
else
fout<<Ltext/Nrcuv<<'\n';
fout.close();
return 0;
}