#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <math.h>
int main(void)
{
    int height[3]={0};
    int weight[3]={0};
    int rank[3]={0,1,2};
    scanf("%d %d",&height[0],&weight[0]);
    scanf("%d %d",&height[1],&weight[1]);
    scanf("%d %d",&height[2],&weight[2]);
    for(int i=0;i<2;i++)
    {
        for(int j=i+1;j<3;j++)
        {
            if(height[i]<height[j])
            {
                int tmp=rank[i];
                rank[i]=rank[j];
                rank[j]=tmp;
            }
            else if (height[i]==height[j])
            {
                if(weight[i]>weight[j])
                {
                    int tmp=rank[i];
                    rank[i]=rank[j];
                    rank[j]=tmp;
                }
            }
            
        }
    }
    for(int i=0;i<3;i++)
    {
        if(rank[i]==0)
        {
            printf("A");
        }
        else if (rank[i]==1)
        {
            printf("B");
        }
        else
        {
            printf("C");
        }
        printf("\n");
    }
}