N = int(input())
books = []
table = ["iti","ni","san","yon"]
dic = {}
for i in range(N):
    name,id = map(str,input().split())
    if not name in books:
        books.append(name)
        dic[name] = [id]
        continue
    dic[name].append(id)
books.sort()
for book in books:
    dic[book].sort()
    for  id in dic[book]:
        print(book +" "+id)