#include<iostream>
using namespace std;
int N,K,T;
string C;
bool win()
{
	int l=K,r=K;
	while(l>=0&&C[l]=='A')l--;
	while(r<N&&C[r]=='A')r++;
	if(l>=0&&(K-l)%2==T%2&&K-l<=T)return true;
	if(r<N&&(r-K)%2==T%2&&r-K<=T)return true;
	return false;
}
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cin>>N>>K>>T>>C;
	K--;
	if(C[K]=='A')
	{
		if(win())cout<<"Alice"<<endl;
		else cout<<"Bob"<<endl;
	}
	else
	{
		for(char&c:C)c=c=='A'?'B':'A';
		if(!win())cout<<"Alice"<<endl;
		else cout<<"Bob"<<endl;
	}
}