Count Even Digits

Difficulty: 800 2000 ms 128 MB

implementation

Count how many digits of N are even (0, 2, 4, 6 or 8).

Input: one integer N.

Output: the number of even digits.

Constraints:

• 0 ≤ N ≤ 10¹⁸

Sample Tests

2739

1

2048

4

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