s = "1 - 2 * ( (60-30 +(-40/5) * (9-2*5/3 + 7 /3*99/4*2998 +10 * 568/14 )) - (-4*3)/ (16-3*2) )"s = "1 - 2 * ( (60-30 +(-40/5) * (9-2*5/3 + 7 /s = "1 - 2 * ( (60-30 +(-40/5) * (9-2*5/3 + 7 /3*99/4*2998 +10 * 568/14 )) - (-4*3)/ (16-3*2) )"s = "1 - 2 * ( (60-30 +(-40/5) * (9-2*5/3 + 7 /