#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <bits/stdc++.h>
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define ff(i,a,b) for(int i=a;i<=b;i++)
#define fb(i,b,a) for(int i=b;i>=a;i--)
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef pair<int,int> pii;
const int maxn = 1000005;
const int inf = 1e9 + 5;
template<typename T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
// os.order_of_key(k) the number of elements in the os less than k
// *os.find_by_order(k) print the k-th smallest number in os(0-based)
int idx = 0;
int ls[50 * maxn], rs[50 * maxn], root[50 * maxn], bor[50 * maxn];
void update(int &v, int rv, int tl, int tr, int pos, int val) {
v = ++idx, ls[v] = ls[rv], rs[v] = rs[rv], bor[v] = bor[rv];
if(tl == tr) {
bor[v]= val;
return;
}
int mid = (tl + tr) / 2;
if(pos <= mid)update(ls[v], ls[rv], tl, mid, pos, val);
else update(rs[v], rs[rv], mid + 1, tr, pos, val);
}
int get(int v, int tl, int tr, int pos) {
if(tl == tr)return bor[v];
int mid = (tl + tr) / 2;
if(pos <= mid)return get(ls[v], tl, mid, pos);
else return get(rs[v], mid + 1, tr, pos);
}
int id = 0;
int br[50 * maxn];
void Init() {
id = 0;
}
const int N = 1e6 + 5;
void TypeLetter(char C) {
id += 1;
int X = C - 'a';
br[id] = br[id - 1] + 1;
update(root[id], root[id - 1], 1, N, br[id], X);
}
void UndoCommands(int X) {
id += 1;
root[id] = root[id - X - 1];
br[id] = br[id - X - 1];
}
char GetLetter(int X) {
X += 1;
return char('a' + get(root[id], 1, N, X));
}
//int main()
//{
// ios::sync_with_stdio(false);
// cout.tie(nullptr);
// cin.tie(nullptr);
// while(1){
// int t;
// cin >> t;
//
// if(t == 1){
// char C;
// cin >> C;
// TypeLetter(C);
// }
//
// if(t == 2){
// int X;
// cin >> X;
// UndoCommands(X);
// }
//
// if(t == 3){
// int X;
// cin >> X;
// cout << GetLetter(X) << endl;
// }
//
// }
// return 0;
//}
/**
1 a
1 b
3 1
1 d
2 2
2 1
3 2
1 e
2 1
2 5
1 c
3 2
// probati bojenje sahovski ili slicno
**/
