#include <iostream>
#include <vector>
char last;
using namespace std;
vector<vector<char> > commands;
void Init() {
vector<char> empty;
commands.push_back(empty);
//cout<<"init done"<<endl;
}
void TypeLetter(char L) {
vector<char> last = commands[commands.size()-1];
last.push_back(L);
commands.push_back(last);
//cout<<"letter added"<<endl;
}
void UndoCommands(int U) {
vector<char> last = commands[commands.size()-U-1];
commands.push_back(last);
//cout<<U<<" commands undone"<<endl;
}
char GetLetter(int P) {
return commands[commands.size()-1][P];
}
