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