Sort digits, then letters

Watch the complete sequence of letters and digits. Each character appears on its own, with a short blank between characters. Keep every character in mind until it is time to answer.

Type the digits first, from smallest to largest. Then type the letters in alphabetical order. Use every shown character once. The practice uses digits 1 to 9 and letters A to Z, with no repeated character within a run.

This diagram holds the sequence still so you can learn the rule. During practice, the full row is hidden when you type. Each round has three runs; levels 1 to 8 use four to eleven characters per run.

You saw B, 3, A, 1. The digits are 3 and 1; putting them in increasing order gives 1, 3. The letters are B and A; alphabetical order gives A, B.

Join the sorted digits and sorted letters: type 13AB. Check that the response contains the same four characters, with both digits before both letters.

Putting the two groups together without sorting would give 31BA. The task asks you to remember which characters appeared and change their order using both sorting rules.

This time the characters are D, 2, B, 7, A. Which response puts the digits in increasing order first, followed by all three letters in alphabetical order?

Check that every character appears exactly once in your answer. Sorting the digits is only the first part; sort the letters too.

This lesson offers two choices so you can check the rule. In the practice, you type the response from memory after the sequence has finished.