#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define sz(x) (int)(x).size()
vector<string> vec;
void Init() {
vec.clear(); vec.pb("");
}
void TypeLetter(char L) {
vec.pb(vec.back() + L);
}
void UndoCommands(int U) {
vec.pb(vec[sz(vec) - 1 - U]);
}
char GetLetter(int P) {
return vec.back()[P];
}
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