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#include<fstream>
using namespace std;
int main()
{
ifstream fin ("text.in");
ofstream fout ("text.out");
char ch;
int sum=0,l=0;
bool flag=false;
while(!fin.eof())
{
fin.get(ch);
if(ch>=65&&ch<=90)
{
sum++;
flag=true;
}
if(ch>=97&&ch<=122)
{
sum++;
flag=true;
}
if(ch<65||ch>122)
{ if(flag==true)
{
l++;flag=false;
}
}
}
if(ch>=97&&ch<=122)
l++;
if(ch>=65&&ch<=90)
l++;
fout<<sum/l;
}