{"problem":{"name":"Lacked Number","description":{"content":"You are given a string $S$ of length exactly $9$ consisting of digits. One but all digits from `0` to `9` appear exactly once in $S$. Print the only digit missing in $S$.","description_type":"Markdown"},"platform":"AtCoder","limit":{"time_limit":2000,"memory_limit":262144},"difficulty":"None","is_remote":true,"is_sync":true,"sync_url":null,"sign":"abc248_a"},"statements":[{"statement_type":"Markdown","content":"You are given a string $S$ of length exactly $9$ consisting of digits. One but all digits from `0` to `9` appear exactly once in $S$.\nPrint the only digit missing in $S$.\n\n## Constraints\n\n*   $S$ is a string of length $9$ consisting of digits.\n*   All characters in $S$ are distinct.\n\n## Input\n\nInput is given from Standard Input in the following format:\n\n$S$\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"abc248_a","tags":[],"sample_group":[["023456789","1\n\nThe string `023456789` only lacks $1$. Thus, $1$ should be printed."],["459230781","6\n\nThe string `459230781` only lacks $6$. Thus, $6$ should be printed.\nNote that the digits in the string may not appear in increasing order."]],"created_at":"2026-03-03 11:01:13"}}