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#include <fstream>
#include <cstring>
#include <cmath>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char c[100001];
int i,litere,cuvinte=0,l,ok;
int main()
{
f.getline(c,5000);
for(i=0;i<strlen(c);i++)
{
if(c[i]>='a'&&c[i]<='z'||c[i]>='A'&&c[i]<='Z')
{
litere++;
}
}
i=0;
while(i<strlen(c))
{
if(c[i]==' '||c[i]==','||c[i]=='-')ok=0;
else if(ok==0)
{
ok=1;
cuvinte++;
}
i++;
}
g<<floor(litere/cuvinte);
return 0;
}