#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
const ll MOD = 998244353;
const ll INF = 1e18;
const ld EPS = 1e-12;
#define endl "\n"
#define sp <<" "<<
#define REP(i, a, b) for(ll i = a; i < b; i++)
#define dbg(x) cout << #x << " = " << x << endl
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define fast_io() ios_base::sync_with_stdio(false); cin.tie(NULL)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define sz(x) ((ll)(x).size())
struct custom_hash {
static uint64_t splitmix64(uint64_t x) {
// http://xorshift.di.unimi.it/splitmix64.c
x += 0x9e3779b97f4a7c15;
x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
return x ^ (x >> 31);
}
size_t operator()(uint64_t x) const {
static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
return splitmix64(x + FIXED_RANDOM);
}
};
template <typename Key, typename Value>
using hash_map = unordered_map<Key, Value, custom_hash>;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
// uniform_int_distribution<int>(a, b)(rng);
// shuffle(all(a), rng);
const int MAXY = 26;
int curr;
string s;
struct trie {
int next[MAXY];
bool output = false;
trie() {
fill(begin(next), end(next), -1);
}
};
vector<trie> t(1);
vector<int> up(1);
void Init() {
s = "";
curr = 0;
// t[0].output = true;
// up[0] = -1;
}
void TypeLetter(char L) {
int x = L - 'a';
if (t[curr].next[x] == -1) {
t[curr].next[x] = t.size();
t.emplace_back();
up.push_back(curr);
// cerr << curr << endl;
}
curr = t[curr].next[x];
t[curr].output = true;
}
void UndoCommands(int U) {
for (int i = 0; i < U; i++) {
if (up[curr] == 0)
break;
t[curr].output = false;
// cerr << curr sp t.size() sp up.size() sp up[curr] << endl;
curr = up[curr];
}
}
char GetLetter(int P) {
int timer = -1;
int x = 0, out;
while (timer != P) {
for (int i = 0; i < MAXY; i++) {
if (t[t[x].next[i]].output == true) {
x = t[x].next[i];
out = i;
timer++;
break;
}
}
}
return out + 'a';
}
// int main() {
// Init();
// int n; cin >> n;
// char command;
// REP(i, 0, n) {
// cin >> command;
// if (command == 'T') {
// char c; cin >> c;
// TypeLetter(c);
// }
// else if (command == 'U') {
// int x; cin >> x;
// UndoCommands(x);
// }
// else {
// int x; cin >> x;
// cout << GetLetter(x) << endl;
// }
// }
// }
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