#include <iostream>
#include <vector>
using namespace std;
vector<int> commands;
void Init() {
//cout<<"init done"<<endl;
}
void TypeLetter(char L) {
commands.push_back(int(L));
//cout<<"letter added"<<endl;
}
void UndoCommands(int U) {
commands.push_back(-U);
//cout<<U<<" commands undone"<<endl;
}
bool first = true;
vector<char>text;
char GetLetter(int P) {
if (first){
// for (int i: commands){
// cout<<i<<' ';
// }
// cout<<endl;
first = false;
int i = commands.size()-1;
while (i > 0){
if (commands[i] < 0){
for (int j = 0; j <= -commands[i]; ++j){
commands.pop_back();
}
i = commands.size()-1;
}else{
i--;
}
}
// for (int i: commands){
// cout<<i<<' ';
// }
// cout<<endl;
for (int i: commands){
text.push_back((char)i);
}
}
return text[P];
}
