###### tags: `APCS` `c++`
# 題解 zerojudge g275: 1. 七言對聯 APCS

#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,x;
	cin>>n;cin.ignore();
	string a,b;
	int i;
	for (i=0;i<n;i++){
		getline(cin,a);
		getline(cin,b);
		x=0;

		if((a[2]==a[6] or a[2]!=a[10]) or (b[2]==b[6] or b[2]!=b[10])) {
			cout<<"A";
			x+=1;
		}

		if(a[12]!='1' or b[12]!='0'){
			cout<<"B";
			x+=1;
		}

		if((a[2]==b[2] or a[6]==b[6]) or a[10]==b[10]){
			cout<<"C";
			x+=1;
		}

		if(x==0)	cout<<"None\n";
		else	cout<<"\n";
		}

	}