//****************************************************** 
/* ? ? ?   ????
/* ? ?      ????                           
/* ? ? ? ??2010 ? 11  ?  17  ?     
/* ? ? ? ???????
/* ? ?      ?1000012752        
*******************************************************/
int main()
{
	char name[4]={'0'};																		//???????????????????
	int a,b,c;																				//abc???
	int i;
	int ta,tb,tc;																			//abc???
	for(a=1 ; a<=3 ; a++)																	//?abc??????????3?????123
	{
		for(b=1 ; b<=3 ; b++)
		{
			for(c=1 ; c<=3 ; c++)
			{
				ta = (b>a) + (c==a);														//??????
				tb = (a>b) + (a>c);															//????????????
				tc = (c>b) + (b>a);
                
                if(  
					 ( ((a<b)&&(ta>tb)) + ((a==b)&&(ta==tb)) + ((a>b)&&(ta<tb)) == 1  )		//????a?b???????a???b????????		
				   &&( ((b<c)&&(tb>tc)) + ((b==c)&&(tb==tc)) + ((b>c)&&(tb<tc)) == 1  )		//????b?c???????b???c????????
				   &&( ((c<a)&&(tc>ta)) + ((c==a)&&(tc==ta)) + ((c>a)&&(tc<ta)) == 1  )	  )	//????c?a???????c???a????????
			
				{																			//??????????abc????
                     name[a] = 'A';															//???????????
					 name[b] = 'B';
					 name[c] = 'C';
				}
			}
		}
	}
	for(i=1 ; i<=3 ; i++)
		cout << name[i];


    return 0;
}