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#include <iostream>
#include <cstring>
using namespace std;
int vocale(char x){
    if(x=='a' || x=='e' || x=='i' || x=='o' || x=='u') return 1;
     if(x=='A' || x=='E' || x=='I' || x=='O' || x=='U') return 1;
     return 0;
}
int main(){
    int i,n,p=-1,u=-1;
    char s[22];
    cin >> s;
    n=strlen(s);
    for(i=0;i<n;i++){
            if(vocale(s[i])==1){p=i; break;}
    }
    for(i=n-1;i>=0;i--){
        if(vocale(s[i])==0){u=i; break;}
    }
    if(p!=-1&&u!=-1){
    char aux=s[p];
    s[p]=s[u];
    s[u]=aux;
    cout << s;}
    else cout << "IMPOSIBIL";


}