#include <stdio.h>

int main(){
	int height[3];
	int weight[3];
	char str[3] = {'A','B','C'};
	
	for(int i = 0;i < 3;i ++){
		scanf("%d%d",height[i],weight[i]);
	}
	
	for(int i = 0;i < 3;i ++){
		for(int j = 0;j < 3;j ++){
			if(height[i] > height[j]){
				int tmp = height[i];
				height[i] = height[j];
				height[j] = tmp;
				tmp = weight[i];
				weight[i] = weight[j];
				weight[j] = tmp;
				char stmp = str[i];
				str[i] = str[j];
				str[j] = stmp;
			}
		}
	}
	
	for(int i = 0;i < 3;i ++){
		for(int j = 0;j < 3;j ++){
			if(height[i] == height[j]){
				if(weight[i] > weight[j]){
					int tmp = weight[i];
					weight[i] = weight[j];
					weight[j] = tmp;
					char stmp = str[i];
					str[i] = str[j];
					str[j] = stmp;
				}
			}
		}
	}
	
	for(int i = 0;i < 3;i ++){
		printf("%c\n",str[i]);
	}
}