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Problems > Counting the Carries

Counting the Carries

Difficulty: 1300 2000 ms 128 MB

math implementation

When adding A and B with the school algorithm, how many carry operations happen?

Input: one line with two integers A and B.

Output: the number of carries.

Constraints:

  • 0 ≤ A, B ≤ 1018

Sample Tests

Input 1
555 545
Output 1
3
Input 2
123 456
Output 2
0

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