from itertools import cycle
from collections import defaultdict
  
with open('data.tmp', 'w', encoding='utf8') as data:
    data.write('3 4\n')
    data.write('car\n')
    data.write('plane\n')
    data.write('robot\n')
    data.write('puzzle\n')
    data.write('5 3\n')
    data.write('car\n')
    data.write('plane\n')
    data.write('robot\n')
    data.write('2 4\n')
    data.write('car\n')
    data.write('plane\n')
    data.write('robot\n')
    data.write('puzzle\n')
  
def solve(fin):
    while True:
        line = fin.readline()
        if not line:
            break
        N, M = [int(n) for n in line.split()]
        gifts = defaultdict(list)
        for kid, gift in zip(cycle(range(N)), range(M)):
            gifts[kid].append(fin.readline()[:-1])
        yield N, gifts
        
with open('data.tmp', 'r', encoding='utf8') as fin:
    for N, gifts in solve(fin):
        for kid in range(N):
            kid_gifts = gifts[kid]
            print(len(kid_gifts), ' '.join(kid_gifts))
        print()