Transform String
Submissions: 8435   Accuracy:


  Difficulty: Medium   Marks: 4

You are provided two strings A and B. You have to transform string A into string B in minimum number of steps. Only one operation is allowed, chose any of the characters in string A and place it in the front of A. If its not possible to transform string A into string B then print -1 otherwise print the minimum number of steps required.

Note: All the characters in the string are lowercase English characters.

Input :

The first line contains integer T, denoting number of test cases. Then T test cases follow . 
The first line of each test case contains two space separated  strings A and B.

Print in a new line the answer of each test case .

Constraints :




bcad abcd
abdd dbad

Output :

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

Author: Sonesh Shukla

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