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#include <fstream>
#include<cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char s[100001];
bool bla ()
{ int s1=0,l;
l=strlen(s);
for(int i=0;i<l;i++)
{
if((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z')) s1++; else return false;
} return true;
}
int main()
{
int m=0,n=0;
while(f>>s)
{ if(bla()) {n+=strlen(s); m++;}
}
g<<n/m;
f.close();
g.close();
return 0;
}