elseif events[1] == "key" then
                if events[2] == 79 then
                        table.insert(equation, #equation, "1")
                elseif events[2] == 80 then
                        table.insert(equation, #equation, "2")
                elseif events[2] == 81 then
                        table.insert(equation, #equation, "3")
                elseif events[2] == 75 then
                        table.insert(equation, #equation, "4")
                elseif events[2] == 76 then
                        table.insert(equation, #equation, "5")
                elseif events[2] == 77 then
                        table.insert(equation, #equation, "6")
                elseif events[2] == 71 then
                        table.insert(equation, #equation, "7")
                elseif events[2] == 72 then
                        table.insert(equation, #equation, "8")
                elseif events[2] == 73 then
                        table.insert(equation, #equation, "9")
                elseif events[2] == 82 then
                        table.insert(equation, #equation, "0")
                elseif events[2] == 83 then
                        table.insert(equation, #equation, ".")
                elseif events[2] == 78 then
                        table.insert(equation, #equation, "+")
                elseif events[2] == 74 then
                        table.insert(equation, #equation, "-")
                elseif events[2] == 55 then
                        table.insert(equation, #equation, "*")
                elseif events[2] == 181 then
                        table.insert(equation, #equation, "/")