#pragma comment(linker, "/STACK:1024000000,1024000000")#include<cstdio>#include<cstring>#include<cmath>#include<algorithm>#include<vector>#include<map>#include<set>#include<queue>#include<stack>#include<ctime>#include<iostream>using namespace std;typedef long long LL;const double pi=acos(-1.0);void File(){    freopen("D:\\in.txt","r",stdin);    freopen("D:\\out.txt","w",stdout);}template <class T>inline void read(T &x){    char c = getchar();    x = 0;    while(!isdigit(c)) c = getchar();    while(isdigit(c))    {        x = x * 10 + c - ‘0‘;        c = getchar();    }}int n,f[200010];int main(){    cin>>n;    int last=n;    for(int i=1;i<=n;i++)    {        int x; cin>>x;        f[x]=1;        while(1)        {            if(f[last])            {                printf("%d ",last);                last--;            }            else break;        }        printf("\n");    }    return 0;}