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#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char a;
bool t;
int cuv,chars;
bool litera(char a)
{
if(int(a)>64 && int(a)<91)
return true;
if(int(a)>96 && int(a)<123)
return true;
return false;
}
int main()
{
while(f.get(a))
{
if(litera(a))
{
t=true;
chars++;
}
else if(t)
{
t=false;
cuv++;
}
}
g<<chars/cuv;
return 0;
}