Intermediate · Text processing · 156 of 264
No repeated letters
An isogram is a word with no letter repeated. Ignore capitals and hyphens.
Input: a word. Output: yes or no
Examples
Input
lumberjack
Output
yes
Input
letter
Output
no
Input
six-year-old
Output
yes
One more test checks other inputs when you press Check.
Stuck? The idea behind text processing
Go through text a character at a time, and build the answer as you go: a new string, or a list of pieces joined at the end with "".join().
ord() gives a character's number and chr() the character for a number: useful for shifting letters.
text = input()
out = []
for ch in text:
out.append(ch.upper() if ch.islower() else ch.lower())
print("".join(out))Watch for: Shifting letters past "z" must wrap round to "a": use % 26 on the letter's position in the alphabet.