#include <bits/stdc++.h>
using namespace std;
#define lli long long int
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define X first
#define Y second
#define pii pair<int, int>
void abc() {cout << endl;}
template <typename T, typename ...U> void abc(T i, U ...j) {
cout << i << ' ', abc(j...);
}
template <typename T> void printv(T l, T r) {
for (; l != r; ++l) cout << *l << " \n"[l + 1 == r];
}
#ifdef Doludu
#define test(args...) abc("[" + string(#args) + "]", args);
#include "grader_C.cpp"
#else
#define test(args...) void(0);
#endif
const int N = 1000000;
vector <string> cur;
void Init() {
cur.pb("");
}
void TypeLetter(char L) {
string t = cur.back();
t += L;
cur.pb(t);
}
void UndoCommands(int U) {
cur.pb(cur[cur.size() - U - 1]);
}
char GetLetter(int P) {
return cur.back()[P];
}
/*
14
T a
T b
P 1
T d
U 2
U 1
P 2
T e
U 1
U 5
T c
P 2
U 2
P 2
*/
