func main()
	var a: int :: cui@inputInt()
	var b: int :: cui@inputInt()
	var c: int :: cui@inputInt()
	var diff: int :: a + b - c
	if(diff > 0)
		var ans: int :: 0
		if(diff < a)
			while(diff > 9 & a > 9)
				do a :- 10
				do diff :- 9
			end while
			do ans :+ diff
		else
			do ans :+ a + 10 * (diff - a)
		end if
		do cui@print("\{ans}\n")
	elif(diff = 0)
		do cui@print("Impossible\n")
	elif(-diff <= 9)
		var ans: int :: 10 - diff
		do cui@print("\{ans}\n")
	else
		do cui@print("Impossible\n")
	end if
end func