{"raw_statement":[{"iden":"problem statement","content":"Takahashi will do a tap dance. The dance is described by a string $S$ where each character is `L`, `R`, `U`, or `D`. These characters indicate the positions on which Takahashi should step. He will follow these instructions one by one in order, starting with the first character.\n$S$ is said to be _easily playable_ if and only if it satisfies both of the following conditions:\n\n*   Every character in an odd position ($1$\\-st, $3$\\-rd, $5$\\-th, $\\ldots$) is `R`, `U`, or `D`.\n*   Every character in an even position ($2$\\-nd, $4$\\-th, $6$\\-th, $\\ldots$) is `L`, `U`, or `D`.\n\nYour task is to print `Yes` if $S$ is easily playable, and `No` otherwise."},{"iden":"constraints","content":"*   $S$ is a string of length between $1$ and $100$ (inclusive).\n*   Each character of $S$ is `L`, `R`, `U`, or `D`."},{"iden":"input","content":"Input is given from Standard Input in the following format:\n\n$S$"},{"iden":"sample input 1","content":"RUDLUDR"},{"iden":"sample output 1","content":"Yes\n\nEvery character in an odd position ($1$\\-st, $3$\\-rd, $5$\\-th, $7$\\-th) is `R`, `U`, or `D`.\nEvery character in an even position ($2$\\-nd, $4$\\-th, $6$\\-th) is `L`, `U`, or `D`.\nThus, $S$ is easily playable."},{"iden":"sample input 2","content":"DULL"},{"iden":"sample output 2","content":"No\n\nThe $3$\\-rd character is not `R`, `U`, nor `D`, so $S$ is not easily playable."},{"iden":"sample input 3","content":"UUUUUUUUUUUUUUU"},{"iden":"sample output 3","content":"Yes"},{"iden":"sample input 4","content":"ULURU"},{"iden":"sample output 4","content":"No"},{"iden":"sample input 5","content":"RDULULDURURLRDULRLR"},{"iden":"sample output 5","content":"Yes"}],"translated_statement":null,"sample_group":[],"show_order":["default"],"formal_statement":null,"simple_statement":null,"has_page_source":true}