#include <iostream>
#include <string>

using namespace std;

int main()
{
   string word;
   cin >> word;
   int position = -1;
   for (int i = 0; i < word.length(); i++)
   {
      char ch = word[i];
      if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u')
      {
         position = i+1;
      }
   }
   cout << "Position: " << position << endl;

   return 0;
}