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#include <iostream>
#include <sstream>
using namespace std;
int strToInt(string str)
{
stringstream sstream;
int ret;
sstream.str(str);
sstream >> ret;
return ret;
}
bool middleNumberIsEqual(string a, string b)
{
return (a[a.length()/2] == b[b.length()/2]);
}
int main()
{
int n, turn = 0;
string a,b;
cin >> n;
cin >> a;
for(int i = 1; i < 2*n; i++)
{
turn++;
cin >> b;
if(!(a.length() % 2))
{
cout << "B" << endl;
return 0;
}
else if(!(b.length() % 2))
{
cout << "A" << endl;
return 0;
}
if(!middleNumberIsEqual(a,b))
{
if(turn % 2)
{
cout << "A" << endl;
return 0;
}
cout << "B" << endl;
return 0;
}
a = b;
}
cout << "=" << endl;
return 0;
}
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