View Compilation Error

0_0_32727733_6648\Main.java:3: 错误: 需要class, interface或enum
public main{
       ^
0_0_32727733_6648\Main.java:4: 错误: 需要class, interface或enum
    public static void main(String[] args) {
                  ^
0_0_32727733_6648\Main.java:6: 错误: 需要class, interface或enum
        while(cin.hasNext())
        ^
0_0_32727733_6648\Main.java:9: 错误: 需要class, interface或enum
            a = cin.nextBigInteger() ;
            ^
0_0_32727733_6648\Main.java:10: 错误: 需要class, interface或enum
            b = cin.nextBigInteger();
            ^
0_0_32727733_6648\Main.java:11: 错误: 需要class, interface或enum
            if(a.equals(b))
            ^
0_0_32727733_6648\Main.java:13: 错误: 需要class, interface或enum
            else System.out.println("NO");
            ^
0_0_32727733_6648\Main.java:14: 错误: 需要class, interface或enum
        }
        ^
8 个错误