{"raw_statement":[{"iden":"statement","content":"给定一个字符串，在字符串中寻找第一个连续出现次数不低于 $k$ 次的字符。"},{"iden":"input","content":"$2$ 行。第 $1$ 行是 $k$；第 $2$ 行是仅包含大小写字母的字符串。"},{"iden":"output","content":"字符串中第一个连续出现次数不低于 `k` 次的字符。如果没有符合条件的字符，输出 `No`。"},{"iden":"note","content":"$1\\leq k\\leq1000$，字符串长度不超过 $1000$。"}],"translated_statement":null,"sample_group":[["3\nabcccaaab","c"]],"show_order":[],"formal_statement":null,"simple_statement":null,"has_page_source":false}