#include <iostream>
#include <sstream>
#include <vector>
using namespace std;
vector<string> stateList(1, "");
void Init() {
return;
}
void TypeLetter(char L) {
stateList.push_back(stateList.back());
stateList.back() += L;
}
void UndoCommands(int U) {
stateList.push_back(stateList[stateList.size()-1-U]);
}
char GetLetter(int P) {
return stateList.back()[P];
}
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