Run-length encoding compresses a string by replacing each run of identical consecutive characters with the character and the length of the run. Write a program that inputs a non-empty string of lowercase letters. For each run, in order, output the character on one line and the run length on the next line. For example, `aaabbc` has runs of 3 `a`s, 2 `b`s and 1 `c`, so the output is: ``` a 3 b 2 c 1 ```