ТЫНЫСТАНОВ

#include <bits/stdc++.h>

using namespace std;

char ch[] = {'A', 'E', 'I', 'O', 'o', 'U', 'u', 'Y'};
map<char, char> nxt;
vector <string> dictionary;

void brute(string t) {
    if (t.size() == 5) {
        dictionary.push_back(t);
        return;
    }
    if (t.empty()) {
        for (int i = 0; i < 8; i++) {
            brute(t + ch[i]);
        }
        return;
    }
    brute(t + t.back());
    brute(t + nxt[t.back()]);
}

int getPos(char c) {
    for (int i = 0; i < 8; i++) {
        if (ch[i] == c) return i;
    }
}

bool cmp(string a, string b) {
    for (int i = 0; i < a.size(); i++) {
        int x = getPos(a[i]);
        int y = getPos(b[i]);
        if (x == y) continue;
        return x < y;
    }
    return 0;
}

int main(){
    ios::sync_with_stdio(0);

    nxt['A'] = 'Y';
    nxt['E'] = 'I';
    nxt['I'] = 'E';
    nxt['O'] = 'U';
    nxt['o'] = 'u';
    nxt['U'] = 'A';
    nxt['u'] = 'o';
    nxt['Y'] = 'A';

    brute("");

    sort(dictionary.begin(), dictionary.end(), cmp);

    string s;
    cin >> s;

    for (int i = 0; i < dictionary.size(); i++) {
        if (dictionary[i] == s) {
            cout << dictionary[i + 1] << endl;
            return 0;
        }
    }
}