# 希望更丰富的展现？使用Markdown
```
include <bits/stdc++.h>
using namespace std;
char a[101],b[101];
int n,i,j;
int main()
{
cin>>n;
j=0;
for (i=1;i<=n;++i)
cin>>a[i];
for (i=1;i<=n;++i)
cin>>b[i];
for (i=1;i=n;++i)
if (a[i]<b[i]) {j=1; break; }
if (j!=1) for (i=1;i<=n;++i) cout<<b[i];
else cout<<-1;
return 0;
}```
by qian_shang @ 2019-01-30 16:45:52
```c++
include <bits/stdc++.h>
using namespace std;
char a[101],b[101];
int n,i,j;
int main()
{
cin>>n;
j=0;
for (i=1;i<=n;++i) cin>>a[i];
for (i=1;i<=n;++i) cin>>b[i];
for (i=1;i=n;++i) if (a[i]<b[i]) {
j=1; break; }
if (j!=1) for (i=1;i<=n;++i) cout<<b[i]; else cout<<-1; return 0;
}
```
for (i=1;**i=n**;++i) if (a[i]<b[i]) {
by TNoName @ 2019-01-30 16:46:34
已解决。。少了一个<
(真.蒟蒻）
by 1335846103w @ 2019-01-30 17:57:01