#include<stdio.h>
#include<string.h>
#include<ctype.h>
int main()
{
    char s[105];
    fgets(s, sizeof(s), stdin);
    size_t len=strlen(s);
    if(len>0 && s[len-1]=='\n')
  {
    s[len-1]='\0';
    len--;
  }
   for(int i=0; i<len; i++)
   {
       if(!(isalnum(s[i])||isspace(s[i])))
       {
           printf("Invalid Input ");
           return 0;
       }
   }
   int seen[256]={0};
   char result[105];
   int k=0;
   for (int i=0; s[i]!='\0';i++)
   {
       char ch=s[i];
       if(isupper (ch)||
       (islower(ch)  && (ch=='a'|| ch=='e'||
       ch=='i'||ch=='o'||ch=='u')))
       {
       if(!seen[(unsigned char)ch])
       {
           result[k++]=ch;
           seen[(unsigned char)ch]=1
       }
   }
       result[k]='\0';
       printf("%s", result);
       return 0;
}