open System

let ri () = stdin.ReadLine() |> int
let ria () = stdin.ReadLine().Split() |> Array.map int

type Sol() =
    member this.Solve() = 
        let N = ri()
        let P = Array.zeroCreate<int> N
        let A = Array.zeroCreate<int []> N
        for i in 0..N-1 do
            let d = ria()
            P.[i] <- d.[0]
            A.[i] <- d.[1..]
        
        let l = [ 
            for i in 0..N-1 do
                for j in 0..P.[i]-1 do 
                     yield (A.[i].[j], i, j)]
        
        let result = l |> List.sortWith (fun (n, i, j) (m, i1, j1) -> (if j <> j1 then j.CompareTo(j1) else i.CompareTo(i1)) ) |> List.map (fun (n, i, j) -> n)
        
        String.Join(" ", result)
        |> printfn "%s"
        
        
        
let mySol = new Sol()
mySol.Solve()