/in/foo.c:1:1: warning: data definition has no type or storage class
    1 | upper = lower = digit = other = 0
      | ^~~~~
/in/foo.c:1:1: warning: type defaults to 'int' in declaration of 'upper' [-Wimplicit-int]
/in/foo.c:1:9: error: 'lower' undeclared here (not in a function)
    1 | upper = lower = digit = other = 0
      |         ^~~~~
/in/foo.c:1:17: error: 'digit' undeclared here (not in a function)
    1 | upper = lower = digit = other = 0
      |                 ^~~~~
/in/foo.c:1:25: error: 'other' undeclared here (not in a function)
    1 | upper = lower = digit = other = 0
      |                         ^~~~~
/in/foo.c:2:1: error: expected ',' or ';' before 's'
    2 | s = input().strip()
      | ^