foo.c: In function 'input':
foo.c:3:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'int'
    3 | int(input(c))
      | ^~~
foo.c:1:5: warning: type of 'a' defaults to 'int' [-Wimplicit-int]
    1 | int(input(a))
      |     ^~~~~
foo.c:6: warning: control reaches end of non-void function [-Wreturn-type]

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