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#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
bool este_litera(char c)
{
if(tolower(c) >= 'a' && tolower(c) <= 'z')
return true;
return false;
}
int main()
{
char s[256];
f.getline(s,256);
int i = 0, nrcuv = 0, nrchars = 0;
while (!(s[i] >= 'a' && s[i] <= 'z') && !(s[i] >= 'A' && s[i] <= 'Z'))
++i;
while(s[i] != '\0')
{
if (este_litera(s[i]))
nrchars++;
if(este_litera(s[i]) && !este_litera(s[i-1]))
nrcuv++;
i++;
}
g << nrchars/nrcuv;
return 0;
}