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#include <fstream>
#include <string.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char a[9000];
unsigned int n=0,nr=0,i;
int main()
{
f.getline(a,9000,'\0');
for(i=0;i<strlen(a);i++)
{
if((a[i]>='a'&&a[i]<='z')||(a[i]>='A'&&a[i]<='Z'))
{while((a[i]>='a'&&a[i]<='z')||(a[i]>='A'&&a[i]<='Z'))
{i++;
nr++;}
n++;
i--;}
}
g<<nr/n;
f.close();
g.close();
}