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**Medium**

A message containing letters from `A-Z`

is being encoded to numbers using the following mapping:

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

Given an encoded message containing digits, determine the total number of ways to decode it.

For example,

Given encoded message `"12"`

,
it could be decoded as `"AB"`

(1 2) or `"L"`

(12).

The number of ways decoding `"12"`

is 2.

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