#include<bits/> string w="0123456789" string a,b int n,x[100],y[100] cin>>n>>a>>b while(a.length()<b.length) a='0'+a while(b.length()<a.length) b= a='0'+a b= for(int i=a.length()-1;i>=0;i--) {x[i]=w.find(a[i],0) y[i]=w.find(x[i],0) }