#include <bits/stdc++.h>
using namespace std;
int main()
{
int l1, l2;
cin >> l1 >> l2;
srand(time(nullptr));
while (l1--)
{
cout << char('A' + rand() % 2);
}
cout << endl;
while (l2--)
{
cout << char('A' + rand() % 2);
}
return 0;
}
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