Shapur extremely gifted student he great include Combinatorics Algebra Number Theory Geometry Calculus etc he smart extraordinarily fast he manage sum 1018 number single secondone day 230 ad Shapur try find possibly calculation fast as result great contest ask come partIn contest give contestant different pair number each number digit 0 1 the contestant write new number corresponding give pair number the rule simple the ith digit answer 1 ith digit give number differ in case ith digit answer 0shapur number try speed he see perform operation number length length number number digit glance he give correct answer expect contestant correct answer he good fellow will not big number give person number lengthnow go Shapurs contest see fast accurate