{"raw_statement":[{"iden":"problem statement","content":"$1000000000000001$ dogs suddenly appeared under the roof of Roger's house, all of which he decided to keep. The dogs had been numbered $1$ through $1000000000000001$, but he gave them new names, as follows:\n\n*   the dogs numbered $1,2,\\cdots,26$ were respectively given the names `a`, `b`, ..., `z`;\n*   the dogs numbered $27,28,29,\\cdots,701,702 $ were respectively given the names `aa`, `ab`, `ac`, ..., `zy`, `zz`;\n*   the dogs numbered $703,704,705,\\cdots,18277,18278 $ were respectively given the names `aaa`, `aab`, `aac`, ..., `zzy`, `zzz`;\n*   the dogs numbered $18279,18280,18281,\\cdots,475253,475254 $ were respectively given the names `aaaa`, `aaab`, `aaac`, ..., `zzzy`, `zzzz`;\n*   the dogs numbered $475255,475256,\\cdots $ were respectively given the names `aaaaa`, `aaaab`, ...;\n*   and so on.\n\nTo sum it up, the dogs numbered $1, 2, \\cdots$ were respectively given the following names:\n`a`, `b`, ..., `z`, `aa`, `ab`, ..., `az`, `ba`, `bb`, ..., `bz`, ..., `za`, `zb`, ..., `zz`, `aaa`, `aab`, ..., `aaz`, `aba`, `abb`, ..., `abz`, ..., `zzz`, `aaaa`, ...\nNow, Roger asks you:\n\"What is the name for the dog numbered $N$?\""},{"iden":"constraints","content":"*   $N$ is an integer.\n*   $1 \\leq N \\leq 1000000000000001$"},{"iden":"input","content":"Input is given from Standard Input in the following format:\n\n$N$"},{"iden":"sample input 1","content":"2"},{"iden":"sample output 1","content":"b"},{"iden":"sample input 2","content":"27"},{"iden":"sample output 2","content":"aa"},{"iden":"sample input 3","content":"123456789"},{"iden":"sample output 3","content":"jjddja"}],"translated_statement":null,"sample_group":[],"show_order":["default"],"formal_statement":null,"simple_statement":null,"has_page_source":true}