char a[]="DCHSA23456789TJQK";
b[99][99],j;
main(i){
scanf("%*d\n");
for(;i=~getchar();getchar())b[~i][getchar()]++;
for(i=0;j=i<4;i++)for(j=4;j<17;j++)b[a[i]][a[j]]&&printf("%c%c ",a[i],a[j]);
}