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Implement a Queue using 2 stacks** s1** and** s2** .

A Query **Q** is of 2 Types

**(i)** 1 x (a query of this type means pushing **'x'** into the queue)

**(ii)** 2 (a query of this type means to pop element from queue and print the poped element)

**Example 1:**

Input:5 1 2 1 3 2 1 4 2Output:2 3Explanation:In the first testcase 1 2 the queue will be {2} 1 3 the queue will be {2 3} 2 poped element will be 2 the queue will be {3} 1 4 the queue will be {3 4} 2 poped element will be 3.

**Example 2:**

Input:4 1 2 2 2 1 4Output:2 -1Explanation:In the second testcase 1 2 the queue will be {2} 2 poped element will be 2 and then the queue will be empty 2 the queue is empty and hence -1 1 4 the queue will be {4}.

**Your Task:**

You are required to complete the two methods **push** which take one argument an integer **'x'** to be pushed into the queue and **pop** which returns a integer poped out from other queue(-1 if the queue is empty). The **printing** is done **automatically **by the** driver code**.

**Expected Time Complexity** : O(1) for **push() **and O(N) for **pop() **or O(N) for **push() **and O(1) for **pop() **

**Expected Auxilliary Space **: O(1).

**Constraints:**

1 <=** **Q <= 100

1 <= x <= 100

Note:The **Input/Ouput** format and **Example** given are used for system's internal purpose, and should be used by a user for **Expected Output** only. As it is a function problem, hence a user should not read any input from stdin/console. The task is to complete the function specified, and not to write the full code.

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Queue using two Stacks

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