import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); int size = scanner.nextInt(); int ints[] = new int[size]; for (int i = 0; i < ints.length; i++) { ints[i] = scanner.nextInt(); } int findNum = scanner.nextInt(); for (int i = 0; i < ints.length; i++) { if (ints[i] == findNum) { System.out.println(i+1); break; }else if (i+1==ints.length) { System.out.println("-1"); //不要忘了输出 -1 ,我纠结了程序半天才发现, } } } }