#include<stdio.h>
#include<string.h>
#include<ctype.h>

int isVowel(char ch){
    ch = tolower(ch);
    return (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u');
}
int main(){
    char s[101], result[101];
    int seen[256] = {0};
    int i, j = 0;
    fgets(s, sizeof(s), stdin);
    s[strcspn(s, "\n")] = '\0';
    for(i=0;s[i] != '\0';i++){
        if(!(isalpha(s[i]) || isdigit(s[i]) || s[i] == ' ')){
            printf("Invalid input\n");
            return 0;
        }
    }
    for(isupper(ch) || isVowel(ch)){
        if(!seen[(unsigned char)ch]){
            seen[(unsigned char)ch] = 1;
            result[j++] = ch;
        }
    }
}
result[j] = '\0';
printf("%s\n",result);
return 0;
}