N = int(input())
l = [[int(i) for i in input().split()] for _ in range(N)]
line = []
Max = max([l[i][0] for i in range(1, len(l))])

for n in range(1, Max):
    for i in range(1, len(l)):
        if l[0][0] != 0:
            line.append(l[i][n])
[print(line[i], end=' ') for i in range(line)]