#include <bits/stdc++.h>
#include <ext/rope>
using namespace std;
using namespace __gnu_cxx;
vector<crope> states;
void Init() {}
void TypeLetter(char L) {
states.push_back(states.back()+L);
}
void UndoCommands(int U) {
states.push_back(states[states.size()-U]);
}
char GetLetter(int P) {
return states.back()[P];
}
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