Greedy 2

def key(a):
    return a[1]
n = int(input())
a = []
for i in range(n):
    x, y = map(int, input().split())
    a.append([x, y])
a.sort(key=key)
print(a)
x = 0
for i in a:
     if(i[0] <= x):
         continue
     print(i[0], i[1], sep=" ")
     x = i[1]