Words by their first letter
Task
The program reads a sentence of lower-case letters without accents and groups its words by their first letter. For each first letter (sorted alphabetically) it prints a line letter: words, with the words in their order in the sentence, separated by spaces.
For the sentence auto bicykel autobus vlak bager the program prints:
Examples
Input
auto bicykel autobus vlak bager
Expected output
a: auto autobus b: bicykel bager v: vlak
After you submit, 4 hidden tests will also check your solution: one word, all with the same letter, repeated words, letters out of order.
Python starts the first time you run code.
Ctrl+Enter runs the program. Tab indents. Press Esc, then Tab, to leave the editor.
Input (stdin)
Each line = one call to input().
Output
Hints
Try it yourself first. Each hint reveals a little more - and lowers the reward a little.
Signed out, hints are free - but no XP is awarded either.
Solution
The solution unlocks after the last hint.