{"problem":{"name":"O. 0x","description":{"content":"You are given an encrypted string, encrypted using a certain algorithm. Decrypt it! The first and single line of input contains a string s, which each of it's characters is an English letter or a dig","description_type":"Markdown"},"platform":"Codeforces","limit":{"time_limit":1000,"memory_limit":262144},"difficulty":"None","is_remote":true,"is_sync":true,"sync_url":null,"sign":"CF10051O"},"statements":[{"statement_type":"Markdown","content":"You are given an encrypted string, encrypted using a certain algorithm. Decrypt it!\n\nThe first and single line of input contains a string s, which each of it's characters is an English letter or a digit or  +  or  =  or  / . (1 ≤ |s| ≤ 105)\n\nPrint the original string.\n\n## Input\n\nThe first and single line of input contains a string s, which each of it's characters is an English letter or a digit or  +  or  =  or  / . (1 ≤ |s| ≤ 105)\n\n## Output\n\nPrint the original string.\n\n[samples]","is_translate":false,"language":"English"},{"statement_type":"Markdown","content":"**Definitions**  \nLet $ s \\in \\Sigma^* $ be the encrypted string, where $ \\Sigma = \\{ \\text{a-z, A-Z, 0-9, +, =, /} \\} $ and $ 1 \\leq |s| \\leq 10^5 $.\n\n**Constraints**  \n1. $ s $ consists only of characters from $ \\Sigma $.  \n2. $ s $ is a valid Base64-encoded string.\n\n**Objective**  \nDecode $ s $ using Base64 decoding to recover the original string $ s_{\\text{orig}} $:  \n$$ s_{\\text{orig}} = \\text{Base64Decode}(s) $$","is_translate":false,"language":"Formal"}],"meta":{"iden":"CF10051O","tags":[],"sample_group":[],"created_at":"2026-03-03 11:00:39"}}