#说内存超。。。。了70% import sys a = int(raw_input("")) list_ = [] for i in range(a): list_.append(map(lambda x:int(x),sys.stdin.readline().strip().split(" "))) list_.sort() find = [] max_y = 0 for i in range(len(list_)-1,-1,-1): max_ = list_[i][1] if max_ >= max_y: max_y = max_ find.append(list_[i]) for i in sorted(find): print " ".join(map(str,i))