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#include <iostream>
#include <fstream>
#include <string>
using namespace std;
string s;
int main()
{
int i,j,cuvinte=0,litere=0;
ifstream intrare("text.in");
ofstream iesire("text.out");
getline(intrare,s);
for (i=0; i<s.size(); ++i)
{
if ( (s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z') )
{
for (j=i; j<s.size(); ++j)
{
if ( (s[j]>='a' && s[j]<='z') || (s[j]>='A' && s[j]<='Z') )
{
litere++;
}
else
{
i=j;
cuvinte++;
break;
}
}
}
}
if (cuvinte!=0)
iesire<<litere/cuvinte;
else
iesire<<litere;
}