{"trustable":true,"sections":[{"title":"Description","value":{"format":"MD","content":"JS students who love to study problems have recently become obsessed with thinking about encryption methods. One day, he suddenly came up with what he thought was the ultimate encryption method: arranging the information to be encrypted in a circle, obviously, they have many different ways of reading.\n\nFor example, \u0027JSOI07\u0027, can be read as: JSOI07 SOI07J OI07JS I07JSO 07JSOI 7JSOI0 Sort them in order of string size: 07JSOI 7JSOI0 I07JSO JSOI07 OI07JS SOI07J Read the last column of characters: I0O7SJ, which is the encrypted string (in fact, this encryption method is very easy to crack, given that it was suddenly thought of, well ^^). However, if the string to be encrypted is too long, can you write a program to complete this task?"}},{"title":"Input","value":{"format":"MD","content":"The input file contains one line, the string to be encrypted. Note that the content of the string may not necessarily be letters, numbers, but also symbols, etc."}},{"title":"Output","value":{"format":"MD","content":"Output one line, which is the encrypted string."}},{"title":"Sample 1","value":{"format":"MD","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\u003e\n\u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eInput\u003c/th\u003e\n \u003cth\u003eOutput\u003c/th\u003e\n \u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003eJSOI07\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003eI0O7SJ\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e"}},{"title":"Hint","value":{"format":"MD","content":"For 40% of the data, the length of the string does not exceed 10000.\n\nFor 100% of the data, the length of the string does not exceed 100000."}}]}