char a[]="DCHSA23456789TJQK";b[99][99],i,j;main(k){for(scanf("%*d\n");i=~getchar();j=i)++k%3||b[~j][~i]++;for(;j=i<4;i++)for(;++j<17;)b[a[i]][a[j]]&&printf("%c%c ",a[i],a[j]);}