#include <bits/stdc++.h>
#include <ext/rope>
using namespace std;
using namespace __gnu_cxx;
using ll = long long;
crope commands[1000010];
ll curCommand = 0;
void Init() {
}
void TypeLetter(char L) {
++curCommand;
commands[curCommand] = commands[curCommand - 1] + L;
}
void UndoCommands(int U) {
++curCommand;
commands[curCommand] = commands[max(0LL, curCommand - U - 1)];
}
char GetLetter(int P) {
return commands[curCommand][P];
}
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