Problem A: Polynomial Summation

## Problem A: Polynomial Summation

Time Limit: 1 Sec  Memory Limit: 512 MB
Submit: 1469  Solved: 330
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## Description

Given two polynomials with n and m terms, please calculate the sum of the two polynomials.

Inputs and outputs are exponentially larger to smaller

## Input

The first line has two numbers: n and m (0<n,m<1000000)

The next n lines are the coefficients and exponents of the terms in the first polynomial.

After that, the next m lines, are the coefficients and exponents of the terms in the second polynomial.

The values of all coefficients and exponents are in the range (-1e9,1e9)

## Output

The first line is an integer k, it is the number of terms in the result.

The next k lines are the coefficients and exponents of the result.

## Sample Input

2 2
1 3
2 1
1 4
2 3


## Sample Output

3
1 4
3 3
2 1


## HINT

The introduction of Polynomial is https://en.wikipedia.org/wiki/Polynomial

You need this. Java FastIO template: https://paste.ubuntu.com/p/6ybMcVXvz5/ in this lab !

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