{"raw_statement":[{"iden":"statement","content":"输入一个字符串，输出该字符串是否回文。回文是指顺读和倒读都一样的字符串。"},{"iden":"input","content":"输入一行字符串，长度小于 $100$。"},{"iden":"output","content":"如果字符串是回文，输出 `yes`；否则，输出 `no`。"}],"translated_statement":null,"sample_group":[["abcdedcba","yes"]],"show_order":[],"formal_statement":null,"simple_statement":null,"has_page_source":false}