1#include <bits/stdc++.h>
  2using namespace std;
  3typedef long long LL;
  4const int N = 1E5+10;
  5const double eps = 1e-8;
  6#define ms(a,x) memset(a,x,sizeof(a))
  7#define lowbit(x) (x&(-x))
  8char buff[N];
  9int len = 0;
 10char ch;
 11void skip()
 12{
 13    while (ch=='\n'||ch==' '||ch=='\t') ch =getchar();
 14}
 15void TAG()
 16{
 17    len = 0;
 18    ch =getchar();
 19    while (ch!='>')
 20    {
 21    buff[len++] = ch;
 22    ch = getchar();
 23    }
 24    buff[len] = 0;
 25}
 26void STR()
 27{
 28    len = 0 ;
 29    while (ch!=' '&&ch!='\t'&&ch!='\n'&&ch!='<')
 30    {
 31    buff[len++] = ch;
 32    ch = getchar();
 33    }
 34    buff[len] = 0;
 35}
 36
 37void pr( int len)
 38{
 39    for ( int i = 0 ; i < len ; i++) putchar(' ');
 40}
 41void solve()
 42{
 43    ch = ' ';
 44    int dep = 0;
 45    for ( ; ;)
 46    {
 47    skip();
 48    if (ch=='<')
 49    {
 50        TAG();
 51        if (buff[0]=='/')
 52        {
 53        dep--;
 54        pr(dep);
 55        }
 56        else if (buff[len-1]=='/')
 57        {
 58        pr(dep);
 59        }
 60        else
 61        {
 62        pr(dep);
 63        dep++;
 64        }
 65        printf("<%s>\n",buff);
 66        if (strcmp(buff,"/html")==0) break;
 67        ch = getchar();
 68    }
 69    else
 70    {
 71        STR();
 72        pr(dep);
 73        printf("%s",buff);
 74        //可能有多个字符串
 75        skip();
 76    //    cout<<"buff:"<<buff<<endl;
 77        while (ch!='<')
 78        {
 79    //  cout<<"ch:"<<ch<<endl;
 80        STR();
 81        printf(" %s",buff);
 82        skip();
 83        }
 84        puts("");
 85        //printf("\n");
 86    }
 87
 88    }
 89}
 90int main(){
 91        freopen("./in.txt","r",stdin);
 92//      freopen("output","w",stdout);
 93    int cas = 0 ;
 94    int T;
 95    cin>>T;
 96
 97   // cout<<"T:"<<T<<endl;
 98    while (T--)
 99    {
100    printf("Case #%d:\n",++cas);
101    solve();
102    }
103    return 0;
104}