#include<stdio.h>

int main(void){
    int ha,hb,hc;
    scanf("%d",&ha);
    scanf("%d",&hb);
    scanf("%d",&hc);

    if(ha>hb&&hb>hc){
        printf("A\nB\nC\n");
    }else if(ha>hb&&hc>hb){
        printf("A\nC\nB\n");
    }else if (hb>ha&&ha>hc){
        printf("B\nA\nCn");
    }else if(hb>hc&&hc>ha){
        printf("B\nC\nA\n");
    }else if(hc>ha&&ha>hb){
        printf("C\nA\nB\n");
    }else if(hc>hb&&hb>ha){
        printf("C\nB\nA\n");
    }
    return 0;
}