#include <stdio.h>
#include <stdlib.h>
#define N 50010
inline int abs(int a){return (a>0)*a - (a<0)*a;}
int mon[N];
int main(){
	int n,i;
	while(1){
		scanf("%d",&n);
		if(n==0)return 0;

		int dif; dif = 0;
		scanf("%d",&mon[0]);
		printf("%d-A",mon[0]); dif = mon[0];
		for(i=1;i<n;i++){
			scanf("%d",&mon[i]);

			if(abs(dif + mon[i]) <= abs(dif - mon[i])){
				dif+=mon[i];
				printf(" %d-A",mon[i]);
			}
			else{
				dif-=mon[i];
				printf(" %d-B",mon[i]);
			}
		}
		printf("\n");
	}
}