#include<bits/stdc++.h>
using namespace std;
int main(){
freopen("p1000.in","r",stdin);
freopen("p1000.out","w",stdout);
int n,s;
cin>>n;
s=65+n;
if(n>26)return 0;
int t=65;
for(int i=1;i<=n;i++){
if(t>=s)return 0;
for(int j=1;j<=i;j++){
cout<<char(t);
}
cout<<endl;
t+=1;
}
fclose(stdin);
fclose(stdout);
return 0;
}
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