#include<bits/stdc++.h>   using namespace std;   typedef long long ll;   const ll MOD =  998244353;   #define rep(i,a,b) for(ll i=a;i<b;++i)    #define pii pair<int,int>      int main()   {       ios_base::sync_with_stdio(0);       cin.tie(0);       int tt=1;       cin>>tt;       while(tt--)       {           int n;           cin>>n;           int a[n];           rep(i,0,n)           cin>>a[i];           vector<int> v;           rep(i,0,n)           {               v.push_back(a[i]);               int p = i+1;               rep(j,i+1,n)               {                   p = j;                   if(a[j]>a[i]) break;                   v.push_back(a[j]);               }               reverse(v.begin()+i,v.end());               i = p-1;               if(p==n-1 && v.size()==n) i=n;           }           for(int i=v.size()-1;i>=0;--i)           cout<<v[i]<<   ;           cout<<  n ;       }   }       