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Your task  is to implement the function atoi. The function takes a string(str) as argument and converts it to an integer and returns it.
 
Input:
The first line of input contains an integer T denoting the no of test cases . Then T test cases follow. Each test case contains a string str .
Output:
For each test case in a new line output will be an integer denoting the converted integer, if the input string is not a numerical string then output will be -1.

Your Task:
Complete the function atoi() which takes a string as input parameter and returns integer value of it. 
if the input string is not a numerical string then returns 1..

Expected Time Complexity: O(|S|), |S| = length of string S.
Expected Auxiliary Space: O(1)


Constraints:
1<=T<=100
1<=length of (s,x)<=10

Example(To be used only for expected output) :
Input:

2
123
21a

Output:
123
-1


Explanation:
Test Case 1: Integer value of '123' is 123.
Test Case 2: Output is -1 as all characters are not digit only.


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.

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

Contributor: Amit Khandelwal, Harshit Sidhwa
Author: Shubham Joshi 1


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