frog 现在是一名编辑，负责审查所谓的敏感词。
她有一段很长的文本 $p$。她的工作相对简单——只需找到敏感词 $w$ 的第一次出现并将其删除。
frog 会不断重复这个过程。请帮她完成这项繁琐的工作。
输入包含多组测试数据。对于每组测试数据：
第一行包含一个字符串 $w$。 第二行包含一个字符串 $p$。
($1 \leq \text{length of } w, p \leq 5 \cdot 10^6$，且 $w, p$ 仅由小写字母组成)
对于每组测试数据，输出一行字符串，表示审查后的文本。
abc aaabcbc b bbb abc ab
a ab
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