ISSUE

• There should be fixed and sample tests where a column contains something like 1.2.3 to invalidate solutions like this

• Python new test framework should be used

• Excessive printing should be removed

SUGGESTION

• Random tests should have a dedicated group block to generate the edge case mentioned above, mixing with other non-digit string inputs in different columns would be even better to invalidate any solutions that check only the first row corresponding column rather than all rows.