#include<fstream>
using namespace std;
int main()
{char c;
long i,nrl;
int ok,gg,nr,okk;
ifstream fin("text.in");
ofstream fout("text.out");
i=0;nrl=0;nr=0;
fin.get(c);
okk=0;
while(fin.get(c))
   {ok=0;gg=0;
   while(c>='a'&&c<='z' || c>='A'&&c<='Z'){nrl++;fin.get(c);ok=1;}
   if(ok==1){i++;okk=1;}
    if(c=='-') if(c!='a'&&c!='e'&&c!='i'&&c!='o'&&c!='u'&&c!=' '){while(c!=' ') {gg=1;fin.get(c);nrl++;}
								 nr++;
								 }
   if(gg==1){i++;okk=1;}

   }


if(okk==1)fout<<(nrl-nr)/i;
fin.close();
fout.close();
return 0;
}