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#include <fstream>
using namespace std;
string s,s0;
bool ch(char x)
{
return ( ((x>='a') && (x<='z')) || ((x<='Z') && (x>='A')) );
}
main()
{
ifstream fin("text.in");
while (!fin.eof())
{
getline(fin,s0);
s+=" "+s0+" ";
}
fin.close();
int w=0,c=0,q=0; char x;
for (int i=0; i<s.size(); i++)
{
x=s[i];
if (ch(x)) c++; else
{
q+=c;
if (c!=0) w++;
c=0;
}
}
ofstream fout("text.out");
fout<<(q+c)/w;
fout.close();
}