-
abc cba
123 321 321123 198.198 891 198+891=1098 1089 1089
a b c a>c 100a+10b+c 100c+10b+a 100a-100c+0+c-a 100 90 10 100a-100c-100+90+10+c-a 100 a-c-1 +90+ 10+c-a 100 10+c-a +90+ a-c-1 900+180+9=1089 1089