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289 B

#include<bits/stdc++.h>
using namespace std;
int main() {
int n,m,j,i;
scanf("%d %d",&n,&m);
char a[n][m];
for(i=0; i<n; i++) {
for(j=0; j<m; j++) {
if(i<=j) {
a[i][j]=65+j-i;
} else {
a[i][j]=65+i-j;
}
printf("%c",a[i][j]);
}
printf("\n");
}
return 0;
}