A, B, C = gets.split.map(&:to_i) need = A + B - C #p need wa = need.abs.to_s.each_char.map(&:to_i).sum #p wa if need > 0 if A >= need + wa p wa else p A + 10*(need-A) end elsif need > -7 && B > 0 p 9 + need else puts "Impossible" end