#include <bits/stdc++.h>

#define pout(n)  printf ("%d\n", n)

#define rep(i,a,n) for (int i = a;i < n;i++)
#define per(i,n,a) for (int i = n-1;i >= a;i--)

const int d4x[4] = {1, 0, -1, 0};
const int d4y[4] = {0, 1, 0, -1};
const int d8x[8] = { 1,1,0,-1,-1,-1,0,1 };
const int d8y[8] = { 0,1,1,1,0,-1,-1,-1 };

typedef long long ll;
using namespace std;

int main() {
  int a,b,c;
  cin >> a >> b >> c;
  if(a>b && a>c){
    printf("A\n");    
    if(b>c){
      printf("B\nC\n");
    }
    else printf("C\nB\n");
  }
  else if(b>a && b>c){
    printf("B\n");    
    if(a>c){
      printf("A\nC\n");
    }
    else printf("C\nA\n");
  }
  else{
    printf("C\n");    
    if(a>b){
      printf("A\nB\n");
    }
    else printf("B\nA\n");
  }
  return 0;
}