//# pragma GCC optimize("Ofast,no-stack-protector")
//# pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
//# pragma GCC optimize("Ofast")
//# pragma GCC optimization ("unroll-loops")
# include "bits/stdc++.h"
/*
# include <ext/pb_ds/tree_policy.hpp>
# include <ext/pb_ds/assoc_container.hpp>
# include <ext/rope>
*/
std::pair<int,int> DR[] = {{-1,0},{0,1},{1,0},{0,-1},{-1,1},{-1,-1},{1,1},{1,-1}};
# define ll long long
# define clock (clock() * 1000.0 / CLOCKS_PER_SEC)
# define rc(s) return cout << s,0
# define rcg(s) cout << s;exit(0)
# define _ ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
# define db(x) cerr << #x << " = " << x << '\n'
# define pb push_back
# define mp make_pair
# define all(s) s.begin(),s.end()
# define sz(x) (int)((x).size())
//# define int ll
using namespace std;
string s = "";
vector<pair<int,int>>ops;
int k = 0;
void Init()
{
}
void TypeLetter(char L)
{
ops.pb(mp(0,L - 'a'));
}
void UndoCommands(int U)
{
ops.pb(mp(1,U));
}
char GetLetter(int P)
{
if(k == 0)
{
k = 1;
int op;
while(sz(ops))
{
if(sz(ops) < op)
{
if(ops.back().first == 0) s += (char)('a' + ops.back().second);
else
{
op = sz(ops) - ops.back().second;
}
}
ops.pop_back();
}
reverse(s.begin(),s.end());
}
return s[P];
}
