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#include <fstream>
#include <cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char a[1000001];
int i,j,nr_cuv,nr,s;
int main()
{ nr_cuv=0;
s=0;
while(f.getline(a,1000001,'\n'));
{
for(i=0;i<strlen(a);i++)
{
j=i;
nr=0;
while((a[j]>='a'&&a[j]<='z')||(a[j]>='A'&&a[j]<='Z'))
{ nr++; j++; }
if(nr!=0)
nr_cuv++;
i=j;
s+=nr;
}}
if(s==0)
g<<0<<'\n';
else
g<<s/nr_cuv<<'\n';
return 0;
}