Practice License Key Formatting

Read the task, work through the examples, and check your approach against the constraints. Use the original LeetCode task for coding and submissions.

Easy#482

LeetCode Problem

License Key Formatting

String

Problem Statement

You are given a license key represented as a string s that consists of only alphanumeric characters and dashes. The string is separated into n + 1 groups by n dashes. You are also given an integer k. We want to reformat the string s such that each group contains exactly k characters, except for the first group, which could be shorter than k but still must contain at least one character. Furthermore, there must be a dash inserted between two groups, and you should convert all lowercase letters to uppercase. Return the reformatted license key.

Source: License Key Formatting on LeetCode. Use the original task for its coding environment and submissions.

Examples

# Example 1

Input

s = "5F3Z-2e-9-w", k = 4

Output

"5F3Z-2E9W"

# Example 2

Input

s = "2-5g-3-J", k = 2

Output

"2-5G-3J"

Constraints

1 <= s.length <= 10^5

s consists of English letters, digits, and dashes '-'.

1 <= k <= 10^4

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