U566633 字符串编辑距离

在自然语言处理中，编辑距离可用于拼写检查、文本相似度计算等。例如，当用户输入一个错误的单词时，通过计算编辑距离可以找出最可能的正确单词；在生物信息学中，也会用编辑距离来比较 DNA 序列的相似度

给定两个字符串 s1 和 s2，计算将 s1 转换为 s2 所需的最少操作次数。允许的操作包括插入一个字符、删除一个字符和替换一个字符。

输入两行，第一行是字符串 s1，第二行是字符串 s2，字符串长度不超过 100

输出将 s1 转换为 s2 所需的最少操作次数

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