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#include <iostream>
#include <fstream>
#include <cstring>
#include <cctype>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char a[100100],v[40000],*p;
int i,k,s;
int main()
{
f.getline(a,100000);
for(i=0;i<strlen(a);i++)
if(!isalpha(a[i]))
v[k++]=a[i];
k=0;
p=strtok(a,v);
while(p)
{
s+=strlen(p);
k++;
p=strtok(NULL,v);
}
g<<s/k<<endl;
return 0;
}