#include <cstdio>
#include <algorithm>

using namespace std;

#define min(a,b) ((a)<(b))?(a):(b)

int ab(int x) {
    if (x<0) return -x;
    return x;
}

int main() {
    int N;
    int p[50001];

    while (scanf("%d",&N),N) {
        for (int i=0;i<N;i++) scanf("%d", p+i);
        sort(p,p+N);

        long long int sumA=0;
        long long int sumB=0;
        int i=0;
        int j=N-1;
        bool first=true;
        int last=-1;
        if (N%2==1) {
            i++;
            last=p[0]; 
        }
        while (1) {
            if (i>j) break;
            if (i==j) break;
            
            // A < i; B < j
            int diff11 = ab( (sumA+p[i])-sumB );
            int diff12 = ab( (sumA+p[i])-(sumB+p[j]) );
            int diff1 = (diff11>diff12)?diff11:diff12;            

            int diff21 = ab( (sumB+p[j])-sumA );
            int diff22 = ab( (sumB+p[j])-(sumA+p[i]) );
            int diff2 = (diff21>diff22)?diff21:diff22;            

            // A < j; B < i
            int diff31 = ab( (sumA+p[j])-sumB );
            int diff32 = ab( (sumA+p[j])-(sumB+p[i]) );
            int diff3 = (diff31>diff32)?diff31:diff32;            

            int diff41 = ab( (sumB+p[i])-sumA );
            int diff42 = ab( (sumB+p[i])-(sumA+p[j]) );
            int diff4 = (diff41>diff42)?diff41:diff42;            

            int best=min(min(diff1,diff2),min(diff3,diff4));

            if (!first) printf(" ");
            if (best==diff1) {
                printf("%d-A %d-B",p[i],p[j]);
                sumA+=p[i];
            //    printf("[%d]",ab(sumA-sumB));
                sumB+=p[j];
            } else if (best==diff2) {
                printf("%d-B %d-A",p[j],p[i]);
                sumA+=p[i];
                sumB+=p[j];
            } else if (best==diff3) {
                printf("%d-A %d-B",p[j],p[i]);
                sumA+=p[j];
                sumB+=p[i];
            } else {
                printf("%d-B %d-A",p[i],p[j]);
                sumA+=p[j];
                sumB+=p[i];
            }

            i++;
            j--;
            first=false;
        }

        if (last!=-1) {
            if (!first) printf(" ");
            if (sumA<sumB) printf("%d-A",last); else printf("%d-B",last);
        }
/*        if (i==j) {
            if (!first) printf(" ");
            if (sumA<sumB) printf("%d-A",p[i]); else printf("%d-B",p[i]);
        }*/
        printf("\n");
    }


    return 0;
}