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#include <bits/stdc++.h>
using namespace std;
int Litera(char ch)
{
if(ch >= 'a' && ch <= 'z' || ch >= 'A' && ch <= 'Z')
{
return 1;
}
return 0;
}
int main(){
ifstream fin("text.in");
long long cuvinte=0,litere=0;
string x;
bool z;
while(fin>>x){
z=false;
for(auto i : x)
if(Litera(i))
{
litere++;
z=true;
}
if(z)
cuvinte++;
}
ofstream fout("text.out");
fout << litere/cuvinte;
return 0;
}