//#include<crest.h>
#include<stdio.h>

int main(void){
    int a, b, c;
    //CREST_int(a);
    //CREST_int(b);
    //CREST_int(c);

    scanf("%d %d %d", &a, &b, &c);

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