#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a,b;
	cin>>a>>b;
	int t=b/a; //计算应该是第几个字母
	if(b%a==0) t--; //如果是整倍数,商需要减一
	char c='A'+t;
	cout<<c; 
	return 0;
}

#include<bits/stdc++.h> using namespace std; int main() { int a,b; cin>>a>>b; int t=b/a;
if(b%a==0)
{ t--; } char c='A'+t;
cout<<c; return 0; }

#include<bits/stdc++.h> using namespace std; int main() {

int a,b;

cin>>a>>b;

int t=b/a;

if(b%a==0)
{
	t--;
}
char c='A'+t;

cout<<c; 

return 0;

}

#include<bits/stdc++.h>

using namespace std;

int main()

{

int a,b;

cin>>a>>b;

int t=b/a;

if(b%a==0)

{
	t--;

}
char c='A'+t;

cout<<c; 

return 0;

}

#include<bits/stdc++.h>

using namespace std;

int main() { int a,b;

cin>>a>>b;

int t=b/a;

if(b%a==0)

{
	t--;
}
char c='A'+t;

cout<<c; 

return 0;

}

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,m;
	cin>>n>>m;
	char a=(m/n)+'A'-1;
	if(m%n!=0) a++;
	cout<<a;
	return 0;
}