{"problem":{"name":"Station and Bus","description":{"content":"In AtCoder City, there are three stations numbered $1$, $2$, and $3$. Each of these stations is operated by one of the two railway companies, A and B. A string $S$ of length $3$ represents which compa","description_type":"Markdown"},"platform":"AtCoder","limit":{"time_limit":2000,"memory_limit":262144},"difficulty":"None","is_remote":true,"is_sync":true,"sync_url":null,"sign":"abc158_a"},"statements":[{"statement_type":"Markdown","content":"In AtCoder City, there are three stations numbered $1$, $2$, and $3$.\nEach of these stations is operated by one of the two railway companies, A and B. A string $S$ of length $3$ represents which company operates each station. If $S_i$ is `A`, Company A operates Station $i$; if $S_i$ is `B`, Company B operates Station $i$.\nTo improve the transportation condition, for each pair of a station operated by Company A and one operated by Company B, there will be a bus service connecting them.\nDetermine if there is a pair of stations that will be connected by a bus service.\n\n## Constraints\n\n*   Each character of $S$ is `A` or `B`.\n*   $|S| = 3$\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":"abc158_a","tags":[],"sample_group":[["ABA","Yes\n\nCompany A operates Station $1$ and $3$, while Company B operates Station $2$.\nThere will be a bus service between Station $1$ and $2$, and between Station $2$ and $3$, so print `Yes`."],["BBA","Yes\n\nCompany B operates Station $1$ and $2$, while Company A operates Station $3$.\nThere will be a bus service between Station $1$ and $3$, and between Station $2$ and $3$, so print `Yes`."],["BBB","No\n\nCompany B operates all the stations. Thus, there will be no bus service, so print `No`."]],"created_at":"2026-03-03 11:01:14"}}