Timer is Running

Given two strings. Find the smallest window in the first string consisting of all the characters of the second string.

Input:
First line of the input contains an integer T, denoting the number of test cases. Then T test case follows. Each test contains 2 lines having a string S (the first string) and next line contains a string (the second string).

Output:
Output the smallest window of the string containing all the characters of the text. If such window doesn`t exist or this task can not be done then print -1.

Your Task:
You don't need to read input or print anything. Your task is to complete the function smallestWindow() which takes two string S and P as inputs and returns the smallest window in string S having all the characters of the string P. In case there are multiple such windows of same length, return the one with the least starting index. Return "-1" in case there's no such window present. 

Expected Time Complexity: O(|S|).
Expected Auxiliary Space: O(1).

Constraints:
1 <= T <= 100
1 <= |S|, |P| <= 1000

Example:
Input:

2
timetopractice
toc
zoomlazapzo
oza

Output:
toprac
apzo

Explanation:
Testcase 1: toprac is the smallest subset in which toc can be found.
Testcase 2: To find oza in the zoomlazapzo the smallest subset is apzo.

** For More Input/Output Examples Use 'Expected Output' option **

Contributor: Yash Kodesia
Author: Yash Kodesia 1


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