#! Python
# -*- coding: utf-8 -*-

import difflib

# txt_a - extra character A at index 196
txt_a = "Chapman: *I* don't know - Mr Wentworth just told me to come in here and say that there was trouble at the mill, that's all - I didn't expect a kind of Spanish Inquisition.[jarring chord] Ximinez: ANobody expects the Spanish Inquisition! Our chief weapon is surprise...surprise and fear...fear and surprise.... Our two weapons are fear and surprise...and ruthless efficiency.... Our *three* weapons are fear, surprise, and ruthless efficiency...and an almost fanatical devotion to the Pope.... Our *four*...no... *Amongst* our weapons.... Amongst our weaponry...are such elements as fear, surprise.... I'll come in again."

# txt_b - extra character B at index 525
txt_b = "Chapman: *I* don't know - Mr Wentworth just told me to come in here and say that there was trouble at the mill, that's all - I didn't expect a kind of Spanish Inquisition.[jarring chord] Ximinez: Nobody expects the Spanish Inquisition! Our chief weapon is surprise...surprise and fear...fear and surprise.... Our two weapons are fear and surprise...and ruthless efficiency.... Our *three* weapons are fear, surprise, and ruthless efficiency...and an almost fanatical devotion to the Pope.... Our *four*...no... *Amongst* our Bweapons.... Amongst our weaponry...are such elements as fear, surprise.... I'll come in again."

seq_match = difflib.SequenceMatcher(None, txt_a, txt_b)
print ("\n".join("%7s a[%d:%d] (%s) b[%d:%d] (%s)" % (tag, i1, i2, txt_a[i1:i2], j1, j2, txt_b[j1:j2]) for tag, i1, i2, j1, j2 in seq_match.get_opcodes()))