#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <list>
#include <set>
#include <map>
#include <algorithm>
#include <functional>

using namespace std;

bool Check(char c)
{
  switch(c) {
  case 'a':
  case 'i':
  case 'u':
  case 'e':
  case 'o':
    return true;
  }
  return false;
}

int main()
{
  ifstream cin("say.txt");
  string str;
  while(cin >> str) {
    if(str == "end")
      break;
    bool ok = true;
    int vn = 0;
    int vc = 0;
    int cc = 0;
    char latest = 0;
    for(int i = 0; i < str.size(); ++i) {
      if(Check(str[i])) {
	cc = 0;
	++vn;
	if(++vc >= 3) {
	  ok = false;
	}
      } else {
	vc = 0;
	if(++cc >= 3) {
	  ok = false;
	}
      }
      if(str[i] == latest && str[i] != 'e' && str[i] != 'o') {
	ok = false;
      }
      latest = str[i];
    }
    if(vn ==0)
      ok = false;
    if(ok)
      cout << "<" << str << "> is acceptable." << endl;
    else
      cout << "<" << str << "> is not acceptable." << endl;
  }
}