#include<iostream>
using namespace std;

int main(){
     char c;
     cin>>c;
     tolower('c');
     switch('c'){
          case 'a' :cout<<"vowel"; break;
          case 'e' :cout<<"vowel"; break;
          case 'i' :cout<<"vowel"; break;
          case 'o' :cout<<"vowel"; break;
          case 'u' :cout<<"vowel"; break;
          default : cout<<"constant";
     }


}
