N = int(input())
l = [[int(i) for i in input().split()] for _ in range(N)]
line = []

for i in range(1, len(l)):
    for j in range(l[i][0]):
        line.append([i, j, l[i][j+1]])
        
line.sort(key=lambda x:(x[1], x[0]))
print(" ".join(str(x[2]) for x in line))