#include <stdio.h>
#include <algorithm>
using namespace std;
struct people{
int h;
int w;
};
bool cmp(people a,people b){
if(a.h==b.h)return a.w<b.w;
return a.h>b.h;
}
int main(){
    int c[3]={0,1,2};
people a[3];
    char b[3]={'A','B','C'};
    for(int i=0;i<3;i++)scanf("%d%d",&a[i].h,&a[i].w);
    for(int i=0;i<6;i++){
        if(cmp(a[c[0]],a[c[1]])&&cmp(a[c[1]],a[c[2]]))printf("%c\n%c\n%c\n",b[c[0]],b[c[1]],b[c[2]]);
        next_permutation(c,c+3);
    }
}