/in/foo.c:1:1: warning: data definition has no type or storage class
    1 | s = input().split(',')
      | ^
/in/foo.c:1:1: warning: type defaults to 'int' in declaration of 's' [-Wimplicit-int]
/in/foo.c:1:5: warning: implicit declaration of function 'input' [-Wimplicit-function-declaration]
    1 | s = input().split(',')
      |     ^~~~~
/in/foo.c:1:12: error: request for member 'split' in something not a structure or union
    1 | s = input().split(',')
      |            ^
/in/foo.c:2:1: error: expected ',' or ';' before 'a'
    2 | a, b, c = map(float, s)
      | ^