Welcome to CS 106B/X Word Ladder!
Please give me two English words, and I will convert the
first into the second by modifying one letter at a time.

Dictionary file name: notfound.txt
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Dictionary file name: oops.txt
Unable to open that file.  Try again.
Dictionary file name: smalldict1.txt

Word 1 (or Enter to quit): code
Word 2 (or Enter to quit): data
A ladder from data back to code:
data date cate cade code 

Word 1 (or Enter to quit): ghost
Word 2 (or Enter to quit): boo
The two words must be the same length.

Word 1 (or Enter to quit): marty
Word 2 (or Enter to quit): keith
The two words must be found in the dictionary.

Word 1 (or Enter to quit): kitty
Word 2 (or Enter to quit): kitty
The two words must be different.

Word 1 (or Enter to quit): dog
Word 2 (or Enter to quit): cat
A ladder from cat back to dog:
cat cot cog dog 

Word 1 (or Enter to quit):
Have a nice day.