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local function digital_clock(str)
local one,two,three,four = str:match('(.)(.):(.)(.)')
if one == '?' then
if tonumber(two) < 4 then return 2 else return 1 end
elseif two == '?' then
if tonumber(one) < 2 then return 9 else return 3 end
elseif three == '?' then
return 5
else return 9
end
end
print(digital_clock('?5:00'))
print(digital_clock('?3:00'))
print(digital_clock('1?:00'))
print(digital_clock('2?:00'))
print(digital_clock('12:?5'))
print(digital_clock('12:5?'))
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