#include<stdio.h>

int main(void){
    int ha, hb, hc;
    
    scanf("%d %d %d", &ha, &hb, &hc);
    if(ha>hb){
        if(hb>hc){
            printf("A\nB\nC\n");
        }
        else if(ha>hc){
            printf("A\nC\nB\n");
        }
        else{
            printf("C\nA\nB\n");
        }
    }else{
        if(ha>hc){
        printf("B\nA\nC\n");
        }
        else if(hb>hc){
            printf("B\nC\nA\n");
        }
        else{
            printf("C\nB\nA\n");
        }
    }
    return 0;
}