#include<bits/stdc++.h>
#define LL long long int
using namespace std;
const int MOD=1e9+7;
const int N=2e5+5;
char s[N],t[N];
char a[N];
int temp1[N],temp2[N];
int main()
{
int k;
cin>>k;
scanf("%s",s);
scanf("%s",t);
int c=0;
for(int i=k-1;i>=0;i--)
{
int tmpt=t[i]-'a'-c,tmps=s[i]-'a';
if(tmpt<tmps)c=1;
else c=0;
temp1[i]=(tmpt+c*26-tmps);
//cout<<tmpt<<' '<<tmps<<' '<<tmpa<<endl;
}
c=0;
for(int i=0;i<k;i++)
{
int tmp=temp1[i]+c*26;
if(tmp%2==1)c=1;
else c=0;
temp2[i]=(tmp-c)/2;
}
c=0;
for(int i=k-1;i>=0;i--)
{
int tmp=temp2[i]+s[i]-'a'+c;
if(tmp>=26)c=1;
else c=0;
a[i]=tmp-c*26+'a';
}
printf("%s",a);
return 0;
}
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