foo.c:1:1: error: unknown type name 'INPUTa'
    1 | INPUTa
      | ^~~~~~
foo.c:2:3: error: 'aMOD2' undeclared here (not in a function)
    2 | b=aMOD2
      |   ^~~~~
foo.c:3:1: error: expected ',' or ';' before 'PRINTb'
    3 | PRINTb
      | ^~~~~~

[Hydro](https://hydro.ac)提供评测服务