n = int(input())

memory = {}
names = []
for _ in range(n):
    name, likes, birthday = input().split()
    likes = int(likes)

    if birthday in memory.keys():
        if memory[birthday][1] < likes:
            names.remove(memory[birthday][0])
            memory[birthday] = (name, likes)
            names.append(name)
    else:
        memory[birthday] = (name, likes)
        names.append(name)

print(len(memory.keys()))
names.sort()
for name in names:
    print(name)