#include<bits/stdc++.h>
using namespace std;
int main(){
freopen("p1753.in","r",stdin);
freopen("p1753.out","w",stdout);
int n,i,j,k=65;
char a[26][26];
cin>>n;
for(i=1;i<=n;i++){
for(j=1;j<=i;j++)a[i][j]=char(k);
k++;
}
for(i=1;i<=n;i++){
for(j=1;j<=i;j++){
cout<<a[j][j];
}
cout<<endl;
}
fclose(stdin);
fclose(stdout);
return 0;
}
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