Number of digits
For given integers N and K (1 <= N, K <= 2000000000) you have to find the number of digits of N^K.
InputStandard input will contain two integers N and K.
OutputTo the standard output print the number of digits of N^K.
Example:
Input:
2 10 Output:
4 Explanation: 2^10 = 1024 so the answer is 4
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