import textwrap
import difflib

def onestepchange(start, dest):

    ret = ""

    for i, s in enumerate(difflib.ndiff(start, dest)):
        # print(i)
        # print(s)

        if s[0] == '-':
            return ret + start[i+1:]

        if s[1] == '+':
            return ret + s[-1] + start[i:]

        ret = ret + s[-1]

        if len(ret) > len(start):
            return ret

        if ret[i] != start[i]:
            return ret + start[i:]

    return ret

def countsteps(start, dest):
    step_count = 0
    while start != dest:
        start = onestepchange(start, dest)
        step_count += 1
    return step_count