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#include<iostream>
#include<fstream>
#include<string.h>
using namespace std;
char a[1100000], sir[]="1234567890-=[];',./~!@#$%^&*()_+{}|:<>? ",*p;
int main(){
ifstream f("text.in");
ofstream g("text.out");
int nr=0, n=0;
while(f.get(a,1100000))
{
f.get();
p=strtok(a,sir);
while(p!=0){
nr=nr+strlen(p);
p=strtok(NULL,sir);
n++;}
}
if(n)
g<<nr/n<<'\n';
else g<<0<<'\n';
return 0;}