#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    for(int i=0;i<n;i++){
        for(char j='A';j<n+'A';j++){
        	cout<<j;
        }
        cout<<endl;
    }
    return 0;
}

#include <bits/stdc++.h>
using namespace std;
int main()
{
    char c = 'A';
    int n;
    cin >> n;
    for (int i = 1; i <= n; i++)
    {
        for (int j = 1; j <= n; j++)
        {
            cout << c;
            c++;
        }
        cout << endl;
        c = 'A';
    }
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    cin>>n;
    for(int i=0;i<n;i++)
    {
        char x;
        for(int j=0;j<n;j++)
        {
            x='A'+i;
            cout<<x;
        }
        cout<<endl;
    }
    return 0;
}

#include <bits/stdc++.h>
using namespace std;
int n;
char a;
int main()
{
    cin >> n;
    for (int i = 1; i <= n; i++)
    {
        a = 'A';
        for (int j = 1; j <= n; j++)
        {
            cout << a;
            char (a += 1);
        }
        cout << endl;
    }
    return 0;
}

#include<iostream>
using namespace std;
int main()
{
int n;
cin>>n;
if(n == 1)
{
for(int i = 1;i<=n;i++)
{
cout<<"A";
}
}
if(n == 2)
{
for(int i = 1;i<=n;i++)
{
cout<<"AB"<<endl;
}
}
if(n == 3)
{
for(int i = 1;i<=n;i++)
{
cout<<"ABC"<<endl;
}
}
if(n == 4)
{
for(int i = 1;i<=n;i++)
{
cout<<"ABCD"<<endl;
}
}
if(n == 5)
{
for(int i = 1;i<=n;i++)
{
cout<<"ABCDE"<<endl;
}
}
if(n == 6)
{
for(int i = 1;i<=n;i++)
{
cout<<"ABCDEF"<<endl;
}
}
if(n == 7)
{
for(int i = 1;i<=n;i++)
{
cout<<"ABCDEFG"<<endl;
}
}
if(n == 8)
{
for(int i = 1;i<=n;i++)
{
cout<<"ABCDEFGH"<<endl;
}
}
if(n == 9)
{
for(int i = 1;i<n;i++)
{
cout<<"ABCDEFGHI"<<endl;
}
}
return 0;
}

"已AC,放心食用~"