The Union of k-Segments

Time Limit: 4 seconds

Memory Limit: 256 megabytes

Description

You are given n segments on the coordinate axis Ox and the number k. The point is satisfied if it belongs to at least k segments. Find the smallest (by the number of segments) set of segments on the coordinate axis Ox which contains all satisfied points and no others.

Input

The first line contains two integers n and k (1 ≤ k ≤ n ≤ 106) — the number of segments and the value of k.

The next n lines contain two integers li, ri ( - 109 ≤ li ≤ ri ≤ 109) each — the endpoints of the i-th segment. The segments can degenerate and intersect each other. The segments are given in arbitrary order.

Output

First line contains integer m — the smallest number of segments.

Next m lines contain two integers aj, bj (aj ≤ bj) — the ends of j-th segment in the answer. The segments should be listed in the order from left to right.

Sample Input

Input
3 2
0 5
-3 2
3 8
Output
2
0 2
3 5
Input
3 2
0 5
-3 3
3 8
Output
1
0 5

Sample Output

None

Hint

None

Source

None

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