foo.c: In function 'main':
foo.c:5:5: error: 'a' undeclared (first use in this function)
    5 |     a = int(input())
      |     ^
foo.c:5:5: note: each undeclared identifier is reported only once for each function it appears in
foo.c:5:9: error: expected expression before 'int'
    5 |     a = int(input())
      |         ^~~

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