foo.c:1:1: warning: data definition has no type or storage class
    1 | a=int(input())
      | ^
foo.c:1:1: warning: type defaults to 'int' in declaration of 'a' [-Wimplicit-int]
foo.c:1:3: error: expected expression before 'int'
    1 | a=int(input())
      |   ^~~
foo.c:7:11: warning: multi-character character constant [-Wmultichar]
    7 |     print('no')
      |           ^~~~
foo.c:9:11: warning: multi-character character constant [-Wmultichar]
    9 |     print('yes')
      |           ^~~~~

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