#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <string>
#include "combo.h"
/*namespace {
constexpr int MAX_N = 2000;
constexpr int MAX_NUM_MOVES = 8000;
int N;
std::string S;
int num_moves;
void wrong_answer(const char *MSG) {
printf("Wrong Answer: %s\n", MSG);
exit(0);
}
} // namespace
int press(std::string p) {
if (++num_moves > MAX_NUM_MOVES) {
wrong_answer("too many moves");
}
int len = p.length();
if (len > 4 * N) {
wrong_answer("invalid press");
}
for (int i = 0; i < len; ++i) {
if (p[i] != 'A' && p[i] != 'B' && p[i] != 'X' && p[i] != 'Y') {
wrong_answer("invalid press");
}
}
int coins = 0;
for (int i = 0, j = 0; i < len; ++i) {
if (j < N && S[j] == p[i]) {
++j;
} else if (S[0] == p[i]) {
j = 1;
} else {
j = 0;
}
coins = std::max(coins, j);
}
return coins;
}*/
std::string guess_sequence(int N)
{
std::string p;
int val=press("AB");
if(val>=1)
{
val=press("A");
if(val==1)
p+='A';
else
p+='B';
}
else
{
val=press("X");
if(val==1)
p+='X';
else
p+='Y';
}
if(N==1)
return p;
for(int l=1;l+2<=N;++l)
{
if(p[0]=='A')
{
val=press(p+'B'+p+"XB"+p+"XX"+p+"XY");
if(val-l==0)
p+='Y';
if(val-l==1)
p+='B';
if(val-l==2)
p+='X';
}
else if(p[0]=='B')
{
val=press(p+'A'+p+"XA"+p+"XX"+p+"XY");
if(val-l==0)
p+='Y';
if(val-l==1)
p+='A';
if(val-l==2)
p+='X';
}
else if(p[0]=='X')
{
val=press(p+'A'+p+"BA"+p+"BB"+p+"BY");
if(val-l==0)
p+='Y';
if(val-l==1)
p+='A';
if(val-l==2)
p+='B';
}
else if(p[0]=='Y')
{
val=press(p+'A'+p+"XA"+p+"XX"+p+"XB");
if(val-l==0)
p+='B';
if(val-l==1)
p+='A';
if(val-l==2)
p+='X';
}
}
if(press(p+'A'+p+'B')==N)
{
if(press(p+'A')==N)
p+='A';
else
p+='B';
}
else
{
if(press(p+'X')==N)
p+='X';
else
p+='Y';
}
return p;
}
/*int main() {
char buffer[MAX_N + 1];
if (scanf("%s", buffer) != 1) {
fprintf(stderr, "Error while reading input\n");
exit(1);
}
S = buffer;
N = S.length();
num_moves = 0;
std::string answer = guess_sequence(N);
if (answer != S) {
wrong_answer("wrong guess");
exit(0);
}
printf("Accepted: %d\n", num_moves);
return 0;
}*/
