let n = Int(readLine()!)!
var l = [[Int]]()
var m = 0
for i in 0..<n{
    l += [readLine()!.split(separator: " ").map{Int($0)!}]
    m += l[i][0]
    l[i].removeFirst()
}
l += [[]]
while l[n].count < m{
    for i in 0..<n{
        if !l[i].isEmpty{
            l[n] += [l[i].removeFirst()]
        }
    }
}
print(l[n].map{String($0)}.joined(separator: " "))