Run-Length Compressor

HARDString Processing9 marks

Read an uppercase word and compress each run of consecutive equal letters.

For every run, output the letter followed by the number of times it appears consecutively.

Input: One uppercase word with at least one character. Output: The compressed string.

Example:

Input:  AAABBCCCC
Output: A3B2C4

Sample Test Cases

Test 1: Several runs

Inputs: AAABBCCCC

Expected: A3B2C4

Test 2: No repeated letters

Inputs: XYZ

Expected: X1Y1Z1

Test 3: One long run

Inputs: AAAAA

Expected: A5

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