String Expression

Have the function StringExpression(str) read the str parameter being passed which will contain the written out version of the numbers 0-9 and the words "minus" or "plus" and convert the expression into an actual final number written out as well. For example: if str is "foursixminustwotwoplusonezero" then this converts to "46 - 22 + 10" which evaluates to 34 and your program should return the final string threefour. If your final answer is negative it should include the word "negative."

Examples

Input: "onezeropluseight"
Output: oneeight

Input: "oneminusoneone"
Output: negativeonezero