Find Mismatch Between Two Strings

[perfringo]

Pen and paper are programmers best friends (as already suggested by deanhystad) :-). Solution could be easily visualized and become obvious:

Output:
	      
          are
         equal
	╭──┴──╮

	c | r | a | t | e |
                  ↘   ↘   ↘
	c | r | e | a | t | e |	

              ╰─┬─╯
	      first
             non equal

'Encountering first unequal character pair all characters in shorter string must equal to next character in longer string'

There are built-in functions in Python to iterate pairwise and to get indices while doing it.