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Problem
Read a non-negative integer `n` and a base `b` (`2 <= b <= 16`). Print the representation of `n` in base `b`. For digits with value greater than or equal to 10, use the uppercase letters `A`, `B`, `C`, `D`, `E`, `F` for 10, 11, 12, 13, 14, and 15 respectively.
Input format
Input
input.txt
The program reads from standard input two non-negative integers, `n` and `b`, separated by a space. - `0 <= n <= 1000000000` - `2 <= b <= 16` - the output contains no leading zeros; if `n = 0`, print `0`
Output format
Output
output.txt
The program prints to standard output the representation of `n` in base `b`, followed by a newline.
Example
input
13 2
output
1101
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Sample cases (from the problem)
Sample Case 1
Input
13 2
Expected output
1101
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