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#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char c;
int64_t nr_cuvinte, litere;
bool litera(char);
int main()
{
while(!f.eof())
{
f.get(c);
if(litera(c))
{
nr_cuvinte++;
while(!f.eof() && litera(c))
{
litere++;
f.get(c);
}
}
}
g << litere / nr_cuvinte;
return 0;
}
bool litera(char c)
{
return (c >= 'a' && c <= 'z')||(c >= 'A' && c <= 'Z');
}