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#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char c='-';
long long S,nr;
bool lit(char c)
{
if((c>='a' && c<='z') || (c>='A' && c<='Z'))return 1;
return 0;
}
int main()
{
long long l=0;
while(f.get(c))
{
if(lit(c))l++;
else {
if(l){nr++;}
S+=l;l=0;
}
}
if(l)nr++,S+=l;
if(nr)g<<S/nr;
else g<<0;
return 0;
}