{"raw_statement":[{"iden":"problem statement","content":"There are $N$ people whose IDs are $1$, $2$, $\\ldots$, and $N$.\nEach of person $1$, person $2$, $\\ldots$, and person $N$ performs the following action once in this order:\n\n*   If person $i$'s ID has not been called out yet, call out person $A_i$'s ID.\n\nEnumerate the IDs of all the people whose IDs are never called out until the end **in ascending order**."},{"iden":"constraints","content":"*   $2 \\leq N \\leq 2 \\times 10^5$\n*   $1 \\leq A_i \\leq N$\n*   $A_i \\neq i$\n*   All values in the input are integers."},{"iden":"input","content":"The input is given from Standard Input in the following format:\n\n$N$\n$A_1$ $A_2$ $\\ldots$ $A_N$"},{"iden":"sample input 1","content":"5\n3 1 4 5 4"},{"iden":"sample output 1","content":"2\n2 4\n\nThe five people's actions are as follows.\n\n*   Person $1$'s ID has not been called out yet, so person $1$ calls out person $3$'s ID.\n*   Person $2$'s ID has not been called out yet, so person $2$ calls out person $1$'s ID.\n*   Person $3$'s ID has already been called out by person $1$, so nothing happens.\n*   Person $4$'s ID has not been called out yet, so person $4$ calls out person $5$'s ID.\n*   Person $5$'s ID has already been called out by person $4$, so nothing happens.\n\nTherefore, person $2$ and $4$'s IDs are not called out until the end."},{"iden":"sample input 2","content":"20\n9 7 19 7 10 4 13 9 4 8 10 15 16 3 18 19 12 13 2 12"},{"iden":"sample output 2","content":"10\n1 2 5 6 8 11 14 17 18 20"}],"translated_statement":null,"sample_group":[],"show_order":["default"],"formal_statement":null,"simple_statement":null,"has_page_source":true}