/*3??????????????
A??B??????C???????
B??A??????A??C???
C????B????B?A????
?????????????????????
???????????3??????
????
???
???? 
????????3???????
ABC */
int main(){
	int a,b,c;
	for(a=1;a<4;a++)
	for(b=1;b<4;b++)
	for(c=1;c<4;c++)
	if(((b>a)+(c==a)==3-a)&&((a>b)+(a>c)==3-b)&&((c>b)+(b>a)==3-c)){
		if(a==2&&b==1&&c==3)
			cout<<"B"<<"A"<<"C";
	    if(a==2&&b==3&&c==1)
	    	cout<<"C"<<"A"<<"B";
	    if(a==3&&b==1&&c==2)
	    	cout<<"B"<<"C"<<"A";
	    if(a==3&&b==2&&c==1)
	    	cout<<"C"<<"B"<<"A";
}
	return 0;
}
