Medium

12.97%

A top secret message containing letters from` A-Z `

is being encoded to numbers using the following mapping:

```
'A' -> 1
'B' -> 2
...
'Z' -> 26
```

You are an FBI agent. You have to determine the total number of ways that message can be decoded.

**Note:** An empty digit sequence is considered to have one decoding. It may be assumed that the input contains valid digits from 0 to 9 and If there are leading 0’s, extra trailing 0’s and two or more consecutive 0’s then it is an invalid string.

**Example :**

Given encoded message "123", it could be decoded as "ABC" (1 2 3) or "LC" (12 3) or "AW"(1 23).

So total ways are 3.

**Input:**

First line contains the test cases T. 1<=T<=1000

Each test case have two lines

First is length of string N. 1<=N<=40

Second line is string S of digits from '0' to '9' of N length.

**Example:
Input:**

2

3

123

4

2563

3

2