int main()
/*3?????????????? 
A??B??????C??????? 
B??A??????A??C??? 
C????B????B?A???? 
????????????????????? 
???????????3?????*/
{
	int a,b,c;		//three persons
	int rank[4];
	int i,j;
	int ta,tb,tc;	//true sentence everyone said
	for (a=1;a<=3;a++)
		for (b=1;b<=3;b++)
		{
			if (a==b)   continue;
			for (c=1;c<=3;c++)
			{
				if (  (c==a)||(c==b)  )		continue;
				ta=(b>a)+(c==a);
				tb=(a>b)+(a>c);
				tc=(c>b)+(b>a);
				if ((a+ta)==3)
					if ((b+tb)==3)
						if ((c+tc)==3)
						{
							rank[1]=a;
							rank[2]=b;
							rank[3]=c;
							for (i=1;i<=3;i++)
								for (j=1;j<=3;j++)
								if (rank[j]==i)		cout <<(char)(64+j);
						}
			}
		}
	return 0;
}