#E00521. 拼接字符串
拼接字符串
输入两个字符串(不含空格),输出将第一个字符串拼接在第二个字符串后的结果
world
hello
helloworld
输入两个字符串(不含空格),输出将第一个字符串拼接在第二个字符串后的结果
world
hello
helloworld
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