{"problem":{"name":"Secret Number","description":{"content":"Takahashi has forgotten his PIN. The PIN is a four-digit string consisting of `0`, `1`, $\\ldots$, `9`, and may begin with a `0`. For each digit `0` through `9`, Takahashi remembers the following fact,","description_type":"Markdown"},"platform":"AtCoder","limit":{"time_limit":2000,"memory_limit":262144},"difficulty":"None","is_remote":true,"is_sync":true,"sync_url":null,"sign":"abc201_c"},"statements":[{"statement_type":"Markdown","content":"Takahashi has forgotten his PIN. The PIN is a four-digit string consisting of `0`, `1`, $\\ldots$, `9`, and may begin with a `0`.\nFor each digit `0` through `9`, Takahashi remembers the following fact, represented by a $10$\\-character string $S_0S_1 \\ldots S_9$:\n\n*   if $S_i$ is `o`: he is certain that the PIN contained the digit $i$;\n*   if $S_i$ is `x`: he is certain that the PIN did not contain the digit $i$;\n*   if $S_i$ is `?`: he is not sure whether the PIN contained the digit $i$.\n\nHow many strings are there that could be Takahashi's PIN?\n\n## Constraints\n\n*   $S$ is a $10$\\-character string consisting of `o`, `x`, and `?`.\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":"abc201_c","tags":[],"sample_group":[["ooo???xxxx","108\n\nSome of the possible PINs are `0123` and `0021`."],["o?oo?oxoxo","0\n\nThere may be no possible PINs, in which case the answer is $0$."],["xxxxx?xxxo","15"]],"created_at":"2026-03-03 11:01:14"}}